Interested in the opportunity, Pitt also placed an $80,000 bid before outbidding himself with a $90,000 bid.
The auction to watch the episode with Clarke started at $20,000, but the race quickly escalated.
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Pitt was ready to cough up six figures to watch an episode of the epic HBO series with Clarke. When he returned, he offered to join in on the viewing with Clarke and the victor, prompting Pitt to raise his own bid, once again, to $120,000.
Brad Pitt bid $120,000 at Sean Penn's charity gala.
Game of Thrones actor Kit Harrington, also in attendance, then offered to sit in on the episode viewing, prompting Pitt to raise his bid to $120,000.
Other personalities in the room were Leonardo DiCaprio, Arnold Schwarzenegger, Jason Segel, Lena Dunham, producer Mark Burnett and Amazon chief Jeff Bezos.
Beyoncé was outed as a massive fan when Clarke stated that she could not take home her own character's dragon eggs because, apparently, rapper Jay-Z bought one for his wife.