Another heated argument erupts between Leonard (Johnny Galecki) and Sheldon (Jim Parsons) in the next episode of "The Big Bang Theory" season 9.

The episode, titled "The Viewing Party Combustion," centers on the "Game of Thrones" viewing party that Leonard and Sheldon organize for the gang. But things will go out of hand when Sheldon forces Leonard to go to a meeting that he does not want to go to.

When Leonard refuses to attend the meeting, Sheldon reminds him that it is stipulated in their roommate agreement. Because of this, the two will get into a big fight.

The animosity between Leonard and Sheldon will get worse when their significant others get involved. Surprisingly, Amy (Mayim Bialik) will side with Leonard while Penny (Kaley Cuoco) opts to support Sheldon. But Amy only chooses to go against her boyfriend because she feels that Sheldon and Penny are very close.

The episode will also show another fight. This time, it will be between Raj (Kunal Nayyar) and Howard (Simon Helberg). Howard will be irritated because Howard cannot stop talking about dating two women and saying that he is having a hard time because of the situation.

The official synopsis for the episode reads:

"Everyone must choose sides when a small argument between Leonard and Sheldon erupts into a heated fight during a group get-together."

Also, viewers of the show will see Stuart (Kevin Sussman) dress up as Jon Snow during the gang's "Game of Thrones" viewing party because Howard tricks him into doing so.

But one of the characters of the show will end up in the hospital in the upcoming episode. Design & Trend revealed that Leonard will prepare a snack with peanuts in it. But Howard, who has a severe allergy to peanuts, will accidentally eat the snack. This will bring the entire gang to the hospital.

"The Big Bang Theory" season 9 episode 21 airs on Thursday, April 21, on CBS.