Barry asks Green Arrow for help when aliens attack Central City, but when they realize that won't be enough, they bring the Legends and Supergirl in on the battle.



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Episode cast overview, first billed only:


When aliens called the Dominators attack Central City, Barry speeds over to Star City to ask the Green Arrow for help in stopping them. Realizing the battle against the Dominators is bigger than they thought, they track down the Legends of Tomorrow, and Barry and Cisco create a breach to bring back a secret weapon - Supergirl. Once all of the super friends are assembled, they come up with a plan to attack but a shocking secret related to Flashpoint is revealed and suddenly no one is sure who they can trust. Meanwhile, Wally wants to join the battle against the aliens but Iris tells him he's not ready.

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Release Date:

29 November 2016 (USA)  »

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Aspect Ratio:

16:9 HD
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Did You Know?


Supergirl's universe is officially dubbed "Earth 38", referencing the year that the first superhero comic, "Action Comics", featuring Superman, was published. See more »


When Barry introduces Supergirl and she levitates to prove her alien nature, she also uses her heat vision to burn her family crest into the floor behind the rest of the team. No one looks at what she's doing, only looking at her, which they should as, from their positions, her heat vision would have had to cut through Professor Stein. The heat-vision effect was added in post and not originally scripted. Later in story-time, Barry has to explain Kara's heat vision to Oliver quickly in battle, which he should know from the aforementioned introduction. Complicated by that explanation being depicted twice. See more »


[first lines]
Green Arrow: Oh, wow! You really did it this time, Barry.
The Flash: Seriously?
Green Arrow: Yeah, yeah. Yeah, seriously! You to come to Star City, ask for my help, and then, inevitably, immediately, we end up the creek!
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Crazy Credits

The logos for Supergirl, Green Arrow, and the Legends of Tomorrow are added to the credits. See more »


Referenced in Supergirl: Medusa (2016) See more »


The Flash Theme
Written by Blake Neely
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User Reviews

Amazing (Crossover wise)
30 November 2016 | by (India) – See all my reviews

Amazing episode. It is so exciting to see all of the superheroes/supergirl's team be united this way!I won't say best episode because for me the best episode of this season so far was last week's (episode 7) episode. There is only one thing that I didn't like

  • it is Cisco's attitude towards Barry. He is taking it way too hard on
Barry.I can understand that he is angry but come on Barry suffered a lot too!How does it feel to know that even if you have power you have watch your mom die in front of you. He sacrificed his own happiness in season 1 final episode and did not change the timeline (may be Cisco didn't remember it?) Watching your father die in front you season 2 was too much pain to handle and he did made a mistake but wasn't he punished for it too when he have to beg his worst enemy to kill his mother AGAIN!!!I don't know much about comic books but I watch this show mostly because of Grant Gustin's Barry Allen and one of the attraction of this show is the bond between Barry/Caitlin/Cisco (which seems to be damaged permanently) so it is very hard to see the treatment Cisco is giving Barry right now :(

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