It will soon be May 4th - and that's a major holiday for The Big Bang Theory gang.

But the celebration on The Big Bang Theory Season 7 Episode 22 gets interrupted after one of Sheldon's heroes dies.

Penny and Leonard attend the funeral, while Sheldon stays home to celebrate Star Wars Day with Howard and Raj. Sheldon gets help dealing with his grief from Professor Proton.

Elsewhere: Leonard and Penny play a relationship game that could have a long term effect on their futures ... or not. It all depends on the answer to an important question.

Amy and Bernadette make a Death Star cake for the Star Wars Day celebration. Will that bring joy to end the day? Check out a few photos from "The Proton Transmogrification" now:

The Big Bang Theory Photos from "The Proton Transmogrification"

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NOTE: you can always watch The Big Bang Theory online in order to catch up on this classic comedy. 

Carla Day is a staff writer for TV Fanatic. Follow her on Twitter and on Google+.