The Proton Transmogrification
The guys prepare for Star Wars Day and plan to watch all six films. Leonard tells Sheldon that Arthur Jeffries (Professor Proton), their childhood hero, has died. While Sheldon is sleeping through the film marathon, Jeffries appears to him dressed as a Jedi Master. He knows neither why he is there nor what advice to give Sheldon, so tells him to cherish the people around him before they die. Penny and Leonard attend Jeffries’ funeral and start discussing their regrets in life; he regrets not having accepted her marriage proposal. Penny later re-proposes as Leonard is more upset about her turning his proposals down than him turning her down. After Leonard returns home, Sheldon wakes up and hugs him, taking Arthur’s advice. Bernadette and Amy make a Death Star cake for the guys while talking about why they became scientists. Finally, Sheldon has another dream where Arthur asks him if watching Star Wars is a useful way to spend his life and Sheldon sees nothing wrong in it.
Title reference: Professor Proton dies and appears in Sheldon’s dream as a Jedi Master.