"The biggest bang of the year is finally here,” says the promo of “The Big Bang Theory” Season 8 finale, titled “The Commitment Determination.” This clip provides a glimpse of Sheldon (Jim Parsons) and Amy (Mayim Bialik) kissing as well as Leonard (Johnny Galecki) and Penny (Kaley Cuoco) can also be seen kissing that too in front of Sheldon. [Check the video below]

[Spoiler Alert: The article contains spoilers from the final episode of "The Big Bang Theory" Season 8, read at your own risk]

The promo hints at one big moment that has been eight years in the making. It probably is talking about Leonard and Penny’s decision to get married in Las Vegas. As previously reported, Sheldon will be seen pushing Leonard and Penny to set their wedding date after Amy starts giving him grief over their relationship's slow pace.

In one of the sneak peeks, Sheldon is seen telling Penny and Leonard that he needs assistance. “Amy is mad at me and I’m not clear why,” he tells Penny. When she asks him whether he was talking before she got upset, Sheldon says “yes.” Penny is seen telling him, that probably is the reason why Amy got upset.

The spoilers leaked online reveal that the episode opens with Sheldon and Amy’s kissing scene. The former, however, is not completely into it, as he is also wondering about whether he should start watching the new “Flash” series. Amy, according to the spoilers, is going to point out the irony --Sheldon taking the slow route when it comes to his relationship with Amy, but admiring a superhero who is known for his speed. She will be upset that even after five years of being together, Sheldon can only give her “a distracted make-out session,” the spoilers reveal. Sheldon, however, fails to see the irony.

Amy is going to put the relationship on a pause mode while Sheldon is going to reveal that he had bought an engagement ring – (he would not get a chance to show that to Amy), according to the spoilers.

Meanwhile the spoilers also reveal that Leonard and Penny will decide to get married in Las Vegas, and not wait for another year, another week or day. And Raj will end up telling Emily (Laura Spencer) that he loves her during their graveyard date. The episode will also see Bernadette (Melissa Rauch) and Howard (Simon Helberg) finding it difficult to tell Stuart (Kevin Sussman) to move out because of one reason or another.

[Youtube/The Big Bang Theory]

[Youtube/Justin Davidson]

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