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As the gang celebrate Star Wars Day, Sheldon has difficulty dealing with the recent death of Arthur "Professor Proton" Jeffries.

The guys are organizing Star Wars: Episode IV - Eine neue Hoffnung (1977) day, which is on May the 4th, the date so chosen because..., and as such the date cannot be changed. They run into a conundrum when they learn that Arthur Jeffries, Leonard and Sheldon's friend and childhood idol as "Professor Proton", has just passed away, his funeral service to be held that day. While Penny plans to accompany Leonard to the funeral, Sheldon plans to partake in Star Wars day with Howard and Raj, since he believes mourning is a wasted emotion, and funerals a superstitious ritual. While Amy and Bernadette are helping with the Star Wars preparations, Sheldon, Howard and Raj start watching the marathon of six movies. But Arthur's death may be hitting Sheldon harder than he realizes, as witnessed by the break he takes from watching the movies. At the funeral, Penny makes an admission about funerals in general, while Leonard contemplates his mortality.—Huggo

The guys celebrate Star Wars Day, but Sheldon learns that his childhood idol Arthur Jeffries has died and he has a hard time dealing with his passing. Sheldon takes a nap to deal with his grief and Arthur arrives in Sheldon's dream as his Obi-Wan Kenobi. Arthur gives Sheldon some helpful advice on how to handle the loss of his father and grandfather. Meanwhile, Leonard and Penny attends Arthur's funeral.—dawsonpersi

The guys are planning their Star Wars Day activities. Penny asks if that is a real holiday like Star Wars' Christmas. Howard explains that that holiday is Wookiee Life Day per the critically panned Star Wars Christmas special. Star Wars Day is on May the Fourth as in "May the Fourth (force) be with you".

That night Leonard knocks on Sheldon's door while he is finalizing the schedule for their celebration. He is including one hour after they see "The Phantom Menace" so that they can complain about it. Leonard has some bad news that he just read on-line that Arthur Jeffries (Professor Proton) has died. He tries to comfort Sheldon by hugging him, who tells him to stop. The funeral is Sunday on Star Wars Day. Sheldon says he is not upset about Professor Proton's death.

Later, at Amy's Apartment, Sheldon is watching an old episode of "Professor Proton". He feels sad that he was struck down in the prime of his own life. Amy wants to know if he wants her to go to the funeral with him, but Sheldon thinks that he won't be able to tell the crying mourners from the sick mourners. Besides, mourning the inevitable is a complete waste of time. Amy mentions that watching all those Star Wars movies is a waste of time. Sheldon tells her that is a good reason for him to withhold sex, if they were in a physical relationship.

Penny dressed for the funeral enters Apartment 4A and gets greeted with "Happy Star Wars' Day". All kinds of Star Wars' themed food are available. Penny gets upset when she realizes she gets their Star Wars in-jokes. Sheldon is being quieter than usual but says that Arthur is gone and there is nothing he can do about. Sheldon feels that since Arthur was a scientist he would not care about silly superstitions like funerals.

In Amy's Apartment, Amy and Bernadette are making a cake in the shape of the Death Star. Amy thinks that Arthur's death was harder on Sheldon than he wants to admit. As they get ready to Cake decorate their spherical cake, it rolls off the table.

At the funeral, Penny admits this funeral is her first since she has never lost anybody close except for a pet pig that was used in a barbecue. Penny didn't know him very well, but she liked him, and she wants to cry. She can't so she tells Leonard to do it for them. He starts to reminisce about Arthur and starts to tear up. Then Penny starts to cry and thanks Leonard for being the emotional one in their relationship.

The guys are debating which order to watch the movies in. Sheldon pops in "The Phantom Menace" which they all just want to get over with. After discussing other orders to watch the movies in, Sheldon gets upset because he wants to see the whole story in numerical order. Sheldon runs into his bedroom. Howard and Raj wonder if they should go after him, but they decide to watch the movies instead. Without Sheldon they decide to start with episode 4 and wonder if they should look in on him, but only after the cantina scene.

Sheldon dreams that he is in the living room looking at old pictures of Arthur Jeffries who then appears to him. He admits to being dead and enjoying not having any bladder problems. He doesn't really know why he is visiting Sheldon since he wants to haunt his ex-wife. Sheldon feels that he is there because he is his Obi Wan coming to advise him as the original did Luke Skywalker. Arthur is not familiar with Star Wars and is confused when he magically changes into Obi-Wan's Jedi costume. He activates his light saber and has fun swinging it around until he cuts himself and asks for a Band-Aid.

In the memorial room, Penny finds the funeral kind of a bummer, while Leonard tells her that she can rent a bounce house. Leonard is thinking about his own mortality and his regrets in life. He regrets not having traveled, taken more risks, learned another language (not Klingon) and having said no when Penny proposed to him. Penny reminds him that it wasn't the right time and then reiterates that "THIS" is also not the right time. The proposal count is currently 2 to 1. To even it out Penny asks if she should propose again so he can turn her down and they are even. Penny proposes. Again Leonard hesitates, but this time jokingly, and tells her that it is a big decision and is not sure he wants to say yes or no.

Amy and Bernadette are fixing their damaged Death Star cake, this time with a flat bottom. Neither of them watched Professor Proton when they were younger. Bernadette got interested in science because she wanted to invent a cure for being short. Amy wanted to be in the Girl Scouts, but her mother thought that they just sell cookies on the street like prostitutes. She found her interest in science when she checked a biology book out of the library to look up what a prostitute was.

On their way back in his car, Leonard is debating whether to say yes or no. Penny again asks Leonard to marry her and he considers a new proposal. Penny tells him to do whatever he wants, so he softens and tells her that he loves her and then he doesn't want to marry her right now. She thanks him and then he brings up the second proposal he heard.

Back in Sheldon's dream they are now in a swamp on the Star Wars planet Dagobah from "The Empire Strikes Back". Arthur thinks that he is in Florida. Obi Wan advised Luke while he was getting his Jedi training, so Sheldon wants to hear wisdom from Arthur. Then they start talking about death and Sheldon mentions losing his Pop-pop and father and eleven Doctor Who's. Since Arthur left, all the men Sheldon looked up to have left. Professor Proton tells Sheldon that people may leave us, but he should cherish and appreciate those who are still with us. Sheldon admits that he does appreciate those around him. Leonard returns, wakes Sheldon up and Sheldon gives Leonard an appreciative hug.

Penny and Leonard join watching the Star Wars movies with Penny still making fun of them. Amy and Bernadette show up with their Death Star cake which everybody loves.

Much later the guys (minus all three girls: Bernadette, Penny and Amy who obviously went to bed in their own apartments) have all fallen asleep in front of the television and Professor Proton again appears to Sheldon. He tells Sheldon that he is wasting his life watching these movies

Title reference: Professor Proton dies and appears in Sheldon's dream as a Jedi Master.