Be sure to watch The Big Bang Theory Season 8 Episode 18 online right here via TV Fanatic to find out what happens when Leonard is left out of an article from Scientific American about the theory he came up with. Instead, Sheldon gets most of the credit, causing some major problems -- and of course, some hilarious moments you won't want to miss.

And when it looks like the last food Mrs. Wolowitz ever made could go to waste, Howard decides to invite everyone over for dinner. Howard, Bernadette, Sheldon, Amy, Leonard, Penny, and Raj all take part in the dinner, which includes some funny conversations followed by an intense argument between Sheldon and Leonard. Was it Sheldon's fault Leonard's name was left out? And how does Leonard deal with the fact that his name isn't mentioned?

Emotions run high as well as the gang honors Mrs. Wolowitz. How will they say goodbye?

It's another can't miss episode of The Big Bang Theory. We know you'll want to join in on the laughs, so watch The Big Bang Theory Season 8 Episode 18 online right here via TV Fanatic now. We offer many ways to watch!