Most Popular "Basement" Titles

 Refine See titles to watch instantly, titles you haven't rated, etc
  • Movies or TV
  • Genres
  • Keywords
  • IMDb Rating
  • Instant Watch Options
  • In Theaters
  • On TV
  • Release Year













































































































IMDb user rating (average) to
Number of votes to »






Reset



Reset
Release year or range to »

1. Batman v Superman: Dawn of Justice (2016)

PG-13 | 151 min | Action, Adventure, Sci-Fi

6.9
Rate this
    1 2 3 4 5 6 7 8 9 10 6.9/10 X  
44 Metascore

Fearing that the actions of Superman are left unchecked, Batman takes on the Man of Steel, while the world wrestles with what kind of a hero it really needs.

Director: Zack Snyder | Stars: Ben Affleck, Henry Cavill, Amy Adams, Jesse Eisenberg

Votes: 386,929 | Gross: $330.25M

2. Lights Out (II) (2016)

PG-13 | 81 min | Fantasy, Horror

6.8
Rate this
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
58 Metascore

When her little brother, Martin, experiences the same events that once tested her sanity, Rebecca works to unlock the truth behind the terror, which brings her face to face with an entity that has an attachment to their mother, Sophie.

Director: David F. Sandberg | Stars: Teresa Palmer, Gabriel Bateman, Maria Bello, Billy Burke

Votes: 18,973 | Gross: $65.47M

3. X-Men: Apocalypse (2016)

PG-13 | 144 min | Action, Adventure, Sci-Fi

7.3
Rate this
    1 2 3 4 5 6 7 8 9 10 7.3/10 X  
52 Metascore

After the re-emergence of the world's first mutant, world-destroyer Apocalypse, the X-Men must unite to defeat his extinction level plan.

Director: Bryan Singer | Stars: James McAvoy, Michael Fassbender, Jennifer Lawrence, Nicholas Hoult

Votes: 155,742 | Gross: $154.99M

4. The Conjuring 2 (2016)

R | 134 min | Horror, Mystery, Thriller

7.7
Rate this
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
65 Metascore

Lorraine and Ed Warren travel to north London to help a single mother raising four children alone in a house plagued by a malicious spirit.

Director: James Wan | Stars: Vera Farmiga, Patrick Wilson, Madison Wolfe, Frances O'Connor

Votes: 72,468 | Gross: $102.46M

5. The Hateful Eight (2015)

R | 187 min | Crime, Drama, Mystery

7.9
Rate this
    1 2 3 4 5 6 7 8 9 10 7.9/10 X  
68 Metascore

In the dead of a Wyoming winter, a bounty hunter and his prisoner find shelter in a cabin currently inhabited by a collection of nefarious characters.

Director: Quentin Tarantino | Stars: Samuel L. Jackson, Kurt Russell, Jennifer Jason Leigh, Walton Goggins

Votes: 278,659 | Gross: $54.12M

6. That '70s Show (1998–2006)

TV-PG | 22 min | Comedy, Romance

8.1
Rate this
    1 2 3 4 5 6 7 8 9 10 8.1/10 X  

A comedy revolving around a group of teenage friends, their mishaps, and their coming of age, set in 1970s Wisconsin.

Stars: Topher Grace, Laura Prepon, Mila Kunis, Danny Masterson

Votes: 116,352

7. Anthropoid (2016)

R | 120 min | Biography, History, Thriller

7.7
Rate this
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
57 Metascore

Based on the extraordinary true story of Operation Anthropoid, the WWII mission to assassinate SS General Reinhard Heydrich, the main architect behind the Final Solution and the Reich's third in command after Hitler and Himmler.

Director: Sean Ellis | Stars: Jamie Dornan, Cillian Murphy, Brian Caspe, Karel Hermánek Jr.

Votes: 1,116 | Gross: $2.77M

8. Pulp Fiction (1994)

R | 154 min | Crime, Drama

8.9
Rate this
    1 2 3 4 5 6 7 8 9 10 8.9/10 X  
94 Metascore

The lives of two mob hit men, a boxer, a gangster's wife, and a pair of diner bandits intertwine in four tales of violence and redemption.

Director: Quentin Tarantino | Stars: John Travolta, Uma Thurman, Samuel L. Jackson, Bruce Willis

Votes: 1,330,505 | Gross: $107.93M

9. Fight Club (1999)

R | 139 min | Drama

8.8
Rate this
    1 2 3 4 5 6 7 8 9 10 8.8/10 X  
66 Metascore

An insomniac office worker, looking for a way to change his life, crosses paths with a devil-may-care soap maker, forming an underground fight club that evolves into something much, much more.

Director: David Fincher | Stars: Brad Pitt, Edward Norton, Meat Loaf, Zach Grenier

Votes: 1,353,990 | Gross: $37.02M

10. Inglourious Basterds (2009)

R | 153 min | Adventure, Drama, War

8.3
Rate this
    1 2 3 4 5 6 7 8 9 10 8.3/10 X  
69 Metascore

In Nazi-occupied France during World War II, a plan to assassinate Nazi leaders by a group of Jewish U.S. soldiers coincides with a theatre owner's vengeful plans for the same.

Directors: Quentin Tarantino, Eli Roth | Stars: Brad Pitt, Diane Kruger, Eli Roth, Mélanie Laurent

Votes: 889,943 | Gross: $120.52M

11. Gone Girl (2014)

R | 149 min | Crime, Drama, Mystery

8.1
Rate this
    1 2 3 4 5 6 7 8 9 10 8.1/10 X  
79 Metascore

With his wife's disappearance having become the focus of an intense media circus, a man sees the spotlight turned on him when it's suspected that he may not be innocent.

Director: David Fincher | Stars: Ben Affleck, Rosamund Pike, Neil Patrick Harris, Tyler Perry

Votes: 574,202 | Gross: $167.74M

12. The Purge (I) (2013)

R | 85 min | Horror, Sci-Fi, Thriller

5.7
Rate this
    1 2 3 4 5 6 7 8 9 10 5.7/10 X  
41 Metascore

In the future, a wealthy family is held hostage for harboring the target of a murderous syndicate during the Purge, a 12-hour period in which any and all crime is legalized.

Director: James DeMonaco | Stars: Ethan Hawke, Lena Headey, Max Burkholder, Adelaide Kane

Votes: 140,858 | Gross: $64.42M

13. The Silence of the Lambs (1991)

R | 118 min | Crime, Drama, Thriller

8.6
Rate this
    1 2 3 4 5 6 7 8 9 10 8.6/10 X  
84 Metascore

A young F.B.I. cadet must confide in an incarcerated and manipulative killer to receive his help on catching another serial killer who skins his victims.

Director: Jonathan Demme | Stars: Jodie Foster, Anthony Hopkins, Lawrence A. Bonney, Kasi Lemmons

Votes: 891,981 | Gross: $130.73M

14. Joy (I) (2015)

PG-13 | 124 min | Biography, Comedy, Drama

6.6
Rate this
    1 2 3 4 5 6 7 8 9 10 6.6/10 X  
56 Metascore

Joy is the story of the title character, who rose to become founder and matriarch of a powerful family business dynasty.

Director: David O. Russell | Stars: Jennifer Lawrence, Robert De Niro, Bradley Cooper, Edgar Ramírez

Votes: 77,060 | Gross: $56.44M

15. Zodiac (2007)

R | 157 min | Crime, Drama, History

7.7
Rate this
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
78 Metascore

A San Francisco cartoonist becomes an amateur detective obsessed with tracking down the Zodiac killer.

Director: David Fincher | Stars: Jake Gyllenhaal, Robert Downey Jr., Mark Ruffalo, Anthony Edwards

Votes: 303,339 | Gross: $33.05M

16. The Visit (I) (2015)

PG-13 | 94 min | Horror, Thriller

6.2
Rate this
    1 2 3 4 5 6 7 8 9 10 6.2/10 X  
55 Metascore

Two siblings become increasingly frightened by their grandparents' disturbing behavior while visiting them on vacation.

Director: M. Night Shyamalan | Stars: Olivia DeJonge, Ed Oxenbould, Deanna Dunagan, Peter McRobbie

Votes: 66,594 | Gross: $65.07M

17. Psycho (1960)

R | 109 min | Horror, Mystery, Thriller

8.5
Rate this
    1 2 3 4 5 6 7 8 9 10 8.5/10 X  

A Phoenix secretary embezzles $40,000 from her employer's client, goes on the run, and checks into a remote motel run by a young man under the domination of his mother.

Director: Alfred Hitchcock | Stars: Anthony Perkins, Janet Leigh, Vera Miles, John Gavin

Votes: 424,410 | Gross: $32.00M

18. This Is the End (2013)

R | 107 min | Comedy, Fantasy

6.7
Rate this
    1 2 3 4 5 6 7 8 9 10 6.7/10 X  
67 Metascore

While attending a party at James Franco's house, Seth Rogen, Jay Baruchel and many other celebrities are faced with the apocalypse.

Directors: Evan Goldberg, Seth Rogen | Stars: James Franco, Jonah Hill, Seth Rogen, Jay Baruchel

Votes: 311,843 | Gross: $101.47M

19. The Bourne Legacy (2012)

PG-13 | 135 min | Action, Adventure, Thriller

6.7
Rate this
    1 2 3 4 5 6 7 8 9 10 6.7/10 X  
61 Metascore

An expansion of the universe from Robert Ludlum's novels, centered on a new hero whose stakes have been triggered by the events of the previous three films.

Director: Tony Gilroy | Stars: Jeremy Renner, Rachel Weisz, Edward Norton, Scott Glenn

Votes: 231,298 | Gross: $113.17M

20. The Exorcist (1973)

R | 122 min | Horror

8.0
Rate this
    1 2 3 4 5 6 7 8 9 10 8/10 X  
82 Metascore

When a teenage girl is possessed by a mysterious entity, her mother seeks the help of two priests to save her daughter.

Director: William Friedkin | Stars: Ellen Burstyn, Max von Sydow, Linda Blair, Lee J. Cobb

Votes: 285,173 | Gross: $204.57M

21. Juno (2007)

PG-13 | 96 min | Comedy, Drama, Romance

7.5
Rate this
    1 2 3 4 5 6 7 8 9 10 7.5/10 X  
81 Metascore

Faced with an unplanned pregnancy, an offbeat young woman makes an unusual decision regarding her unborn child.

Director: Jason Reitman | Stars: Ellen Page, Michael Cera, Jennifer Garner, Jason Bateman

Votes: 415,743 | Gross: $143.49M

22. War of the Worlds (2005)

PG-13 | 116 min | Adventure, Sci-Fi, Thriller

6.5
Rate this
    1 2 3 4 5 6 7 8 9 10 6.5/10 X  
73 Metascore

As Earth is invaded by alien tripod fighting machines, one family fights for survival.

Director: Steven Spielberg | Stars: Tom Cruise, Dakota Fanning, Tim Robbins, Miranda Otto

Votes: 335,531 | Gross: $234.28M

23. Crazy, Stupid, Love. (2011)

PG-13 | 118 min | Comedy, Drama, Romance

7.4
Rate this
    1 2 3 4 5 6 7 8 9 10 7.4/10 X  
68 Metascore

A middle-aged husband's life changes dramatically when his wife asks him for a divorce. He seeks to rediscover his manhood with the help of a newfound friend, Jacob, learning to pick up girls at bars.

Directors: Glenn Ficarra, John Requa | Stars: Steve Carell, Ryan Gosling, Julianne Moore, Emma Stone

Votes: 376,486 | Gross: $84.24M

24. The Babadook (2014)

Not Rated | 93 min | Drama, Fantasy, Horror

6.8
Rate this
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
86 Metascore

A single mother, plagued by the violent death of her husband, battles with her son's fear of a monster lurking in the house, but soon discovers a sinister presence all around her.

Director: Jennifer Kent | Stars: Essie Davis, Noah Wiseman, Daniel Henshall, Hayley McElhinney

Votes: 114,802 | Gross: $0.92M

25. Panic Room (2002)

R | 112 min | Crime, Drama, Thriller

6.8
Rate this
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
65 Metascore

A divorced woman and her diabetic daughter take refuge in their newly-purchased house's safe room, when three men break-in, searching for a missing fortune.

Director: David Fincher | Stars: Jodie Foster, Kristen Stewart, Forest Whitaker, Dwight Yoakam

Votes: 206,882 | Gross: $95.31M

26. The Mortal Instruments: City of Bones (2013)

PG-13 | 130 min | Fantasy, Horror, Mystery

6.0
Rate this
    1 2 3 4 5 6 7 8 9 10 6/10 X  
33 Metascore

When her mother disappears, Clary Fray learns that she descends from a line of warriors who protect our world from demons. She joins forces with others like her and heads into a dangerous alternate New York called the Shadow World.

Director: Harald Zwart | Stars: Lily Collins, Jamie Campbell Bower, Robert Sheehan, Jemima West

Votes: 107,472 | Gross: $31.17M

27. Gran Torino (2008)

R | 116 min | Drama

8.2
Rate this
    1 2 3 4 5 6 7 8 9 10 8.2/10 X  
72 Metascore

Disgruntled Korean War veteran Walt Kowalski sets out to reform his neighbor, a Hmong teenager who tried to steal Kowalski's prized possession: a 1972 Gran Torino.

Director: Clint Eastwood | Stars: Clint Eastwood, Bee Vang, Christopher Carley, Ahney Her

Votes: 563,838 | Gross: $148.09M

28. The Truman Show (1998)

PG | 103 min | Comedy, Drama, Sci-Fi

8.1
Rate this
    1 2 3 4 5 6 7 8 9 10 8.1/10 X  
90 Metascore

An insurance salesman/adjuster discovers his entire life is actually a television show.

Director: Peter Weir | Stars: Jim Carrey, Ed Harris, Laura Linney, Noah Emmerich

Votes: 671,448 | Gross: $125.60M

29. Disturbia (2007)

PG-13 | 105 min | Drama, Mystery, Thriller

6.9
Rate this
    1 2 3 4 5 6 7 8 9 10 6.9/10 X  
62 Metascore

A teen living under house arrest becomes convinced his neighbor is a serial killer.

Director: D.J. Caruso | Stars: Shia LaBeouf, David Morse, Carrie-Anne Moss, Sarah Roemer

Votes: 187,576 | Gross: $80.05M

30. The Evil Dead (1981)

NC-17 | 85 min | Fantasy, Horror

7.6
Rate this
    1 2 3 4 5 6 7 8 9 10 7.6/10 X  
70 Metascore

Five friends travel to a cabin in the woods, where they unknowingly release flesh-possessing demons.

Director: Sam Raimi | Stars: Bruce Campbell, Ellen Sandweiss, Richard DeManincor, Betsy Baker

Votes: 141,897

31. The King of Queens (1998–2007)

TV-PG | 22 min | Comedy

7.4
Rate this
    1 2 3 4 5 6 7 8 9 10 7.4/10 X  

Delivery man Doug Heffernan has a good life: He's got a pretty wife (Carrie), a big TV and friends to watch it with. Then Carrie's goofy and annoying father Arthur moves in with them.

Stars: Kevin James, Leah Remini, Jerry Stiller, Victor Williams

Votes: 60,732

32. Home Alone (1990)

PG | 103 min | Comedy, Family

7.5
Rate this
    1 2 3 4 5 6 7 8 9 10 7.5/10 X  
63 Metascore

An 8-year old troublemaker must protect his home from a pair of burglars when he is accidentally left home alone by his family during Christmas vacation.

Director: Chris Columbus | Stars: Macaulay Culkin, Joe Pesci, Daniel Stern, John Heard

Votes: 312,521 | Gross: $285.76M

33. The IT Crowd (2006–2013)

TV-14 | 25 min | Comedy

8.6
Rate this
    1 2 3 4 5 6 7 8 9 10 8.6/10 X  

The comedic adventures of a rag-tag group of technical support workers at a large corporation.

Stars: Chris O'Dowd, Richard Ayoade, Katherine Parkinson, Matt Berry

Votes: 92,514

34. Misery (1990)

R | 107 min | Crime, Drama, Thriller

7.8
Rate this
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  

After a famous author is rescued from a car crash by a fan of his novels, he comes to realize that the care he is receiving is only the beginning of a nightmare of captivity and abuse.

Director: Rob Reiner | Stars: James Caan, Kathy Bates, Richard Farnsworth, Frances Sternhagen

Votes: 134,040 | Gross: $61.28M

35. Movie 43 (2013)

R | 94 min | Comedy, Romance

4.3
Rate this
    1 2 3 4 5 6 7 8 9 10 4.3/10 X  
18 Metascore

A series of interconnected short films follows a washed-up producer as he pitches insane story lines featuring some of the biggest stars in Hollywood.

Directors: Elizabeth Banks, Steven Brill, Steve Carr, Rusty Cundieff, James Duffy, Griffin Dunne, Peter Farrelly, Patrik Forsberg, Will Graham, James Gunn, Brett Ratner, Jonathan van Tulleken, Bob Odenkirk | Stars: Emma Stone, Stephen Merchant, Richard Gere, Liev Schreiber

Votes: 79,407 | Gross: $8.83M

36. The Village (2004)

PG-13 | 108 min | Drama, Mystery, Romance

6.5
Rate this
    1 2 3 4 5 6 7 8 9 10 6.5/10 X  
44 Metascore

A series of events tests the beliefs of a small isolated countryside village.

Director: M. Night Shyamalan | Stars: Sigourney Weaver, William Hurt, Joaquin Phoenix, Bryce Dallas Howard

Votes: 194,331 | Gross: $114.20M

37. Scouts Guide to the Zombie Apocalypse (2015)

R | 93 min | Action, Comedy, Horror

6.3
Rate this
    1 2 3 4 5 6 7 8 9 10 6.3/10 X  
32 Metascore

Three scouts, on the eve of their last camp-out, discover the true meaning of friendship when they attempt to save their town from a zombie outbreak.

Director: Christopher Landon | Stars: Tye Sheridan, Logan Miller, Joey Morgan, Sarah Dumont

Votes: 25,323 | Gross: $3.64M

38. Dark Places (2015)

R | 113 min | Drama, Mystery, Thriller

6.2
Rate this
    1 2 3 4 5 6 7 8 9 10 6.2/10 X  
39 Metascore

Libby Day was only eight years old when her family was brutally murdered in their rural Kansas farmhouse. Almost thirty years later, she reluctantly agrees to revisit the crime and uncovers the wrenching truths that led up to that tragic night.

Director: Gilles Paquet-Brenner | Stars: Charlize Theron, Nicholas Hoult, Christina Hendricks, Chloë Grace Moretz

Votes: 27,665

39. Tremors (1990)

PG-13 | 96 min | Comedy, Horror, Sci-Fi

7.2
Rate this
    1 2 3 4 5 6 7 8 9 10 7.2/10 X  
65 Metascore

Natives of a small isolated town defend themselves against strange underground creatures which are killing them one by one.

Director: Ron Underwood | Stars: Kevin Bacon, Fred Ward, Finn Carter, Michael Gross

Votes: 90,492 | Gross: $16.67M

40. The Butterfly Effect (2004)

R | 113 min | Sci-Fi, Thriller

7.7
Rate this
    1 2 3 4 5 6 7 8 9 10 7.7/10 X  
30 Metascore

Evan Treborn suffers blackouts during significant events of his life. As he grows up, he finds a way to remember these lost memories and a supernatural way to alter his life by reading his journal.

Directors: Eric Bress, J. Mackye Gruber | Stars: Ashton Kutcher, Amy Smart, Melora Walters, Elden Henson

Votes: 358,970 | Gross: $0.02M

41. My Girl (1991)

PG-13 | 102 min | Comedy, Drama, Family

6.8
Rate this
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  

A young girl, on the threshold of her teen years, finds her life turning upside down, when she is accompanied by an unlikely friend.

Director: Howard Zieff | Stars: Anna Chlumsky, Macaulay Culkin, Dan Aykroyd, Jamie Lee Curtis

Votes: 56,071 | Gross: $59.85M

42. This Is Where I Leave You (2014)

R | 103 min | Comedy, Drama

6.6
Rate this
    1 2 3 4 5 6 7 8 9 10 6.6/10 X  
44 Metascore

When their father passes away, four grown siblings are forced to return to their childhood home and live under the same roof together for a week, along with their over-sharing mother and an assortment of spouses, exes and might-have-beens.

Director: Shawn Levy | Stars: Jason Bateman, Tina Fey, Jane Fonda, Adam Driver

Votes: 54,660 | Gross: $34.29M

43. Signs (2002)

PG-13 | 106 min | Drama, Sci-Fi, Thriller

6.7
Rate this
    1 2 3 4 5 6 7 8 9 10 6.7/10 X  
59 Metascore

A family living on a farm finds mysterious crop circles in their fields which suggests something more frightening to come.

Director: M. Night Shyamalan | Stars: Mel Gibson, Joaquin Phoenix, Rory Culkin, Abigail Breslin

Votes: 272,350 | Gross: $227.97M

44. Annabelle (I) (2014)

R | 99 min | Horror, Mystery

5.4
Rate this
    1 2 3 4 5 6 7 8 9 10 5.4/10 X  
37 Metascore

A couple begins to experience terrifying supernatural occurrences involving a vintage doll shortly after their home is invaded by satanic cultists.

Director: John R. Leonetti | Stars: Ward Horton, Annabelle Wallis, Alfre Woodard, Tony Amendola

Votes: 82,454 | Gross: $84.26M

45. The Human Centipede (First Sequence) (2009)

R | 92 min | Horror

4.4
Rate this
    1 2 3 4 5 6 7 8 9 10 4.4/10 X  
33 Metascore

A mad scientist kidnaps and mutilates a trio of tourists in order to reassemble them into a human centipede, created by stitching their mouths to each others' rectums.

Director: Tom Six | Stars: Dieter Laser, Ashley C. Williams, Ashlynn Yennie, Akihiro Kitamura

Votes: 57,735 | Gross: $0.18M

46. Stoker (2013)

R | 99 min | Drama, Thriller

6.8
Rate this
    1 2 3 4 5 6 7 8 9 10 6.8/10 X  
58 Metascore

After India's father dies, her Uncle Charlie, who she never knew existed, comes to live with her and her unstable mother. She comes to suspect this mysterious, charming man has ulterior motives and becomes increasingly infatuated with him.

Director: Chan-wook Park | Stars: Mia Wasikowska, Nicole Kidman, Matthew Goode, Dermot Mulroney

Votes: 84,915 | Gross: $1.70M

47. The Book Thief (2013)

PG-13 | 131 min | Drama, War

7.6
Rate this
    1 2 3 4 5 6 7 8 9 10 7.6/10 X  
53 Metascore

While subjected to the horrors of World War II Germany, young Liesel finds solace by stealing books and sharing them with others. In the basement of her home, a Jewish refugee is being protected by her adoptive parents.

Director: Brian Percival | Stars: Sophie Nélisse, Geoffrey Rush, Emily Watson, Ben Schnetzer

Votes: 99,257 | Gross: $21.48M

48. The Amityville Horror (2005)

R | 90 min | Drama, Horror, Mystery

6.0
Rate this
    1 2 3 4 5 6 7 8 9 10 6/10 X  
33 Metascore

Newlyweds are terrorized by demonic forces after moving into a large house that was the site of a grisly mass murder a year before.

Director: Andrew Douglas | Stars: Ryan Reynolds, Melissa George, Jimmy Bennett, Jesse James

Votes: 81,250 | Gross: $64.26M

49. The Judge (2014)

R | 141 min | Crime, Drama

7.4
Rate this
    1 2 3 4 5 6 7 8 9 10 7.4/10 X  
48 Metascore

Big-city lawyer Hank Palmer returns to his childhood home where his father, the town's judge, is suspected of murder. Hank sets out to discover the truth and, along the way, reconnects with his estranged family.

Director: David Dobkin | Stars: Robert Downey Jr., Robert Duvall, Vera Farmiga, Billy Bob Thornton

Votes: 137,614 | Gross: $47.11M

50. The Fugitive (1993)

PG-13 | 130 min | Action, Adventure, Crime

7.8
Rate this
    1 2 3 4 5 6 7 8 9 10 7.8/10 X  
88 Metascore

Dr. Richard Kimble, unjustly accused of murdering his wife, must find the real killer while being the target of a nationwide manhunt.

Director: Andrew Davis | Stars: Harrison Ford, Tommy Lee Jones, Sela Ward, Julianne Moore

Votes: 214,355 | Gross: $183.88M