The Big Bang Theory Season Finale Ends In A Cliffhanger

The sixth season of The Big Bang Theory will come to an end tonight, and CBS is teasing a big cliffhanger for the season finale. The Big Bang Theory season finale episode is called "The Bon Voyage Reaction." In "The Bon Voyage Reaction," Leonard is offered his dream job of going on an expedition to the North Seas with Steve Hawking's crew. The only problem is that it will mean being away from his girlfriend Penny for four months. Leonard's roommate Sheldon also doesn't want to be left alone. In addition to the Leonard and Penny dilemma, Koothrappali is also having relationship issues, as he pushes Lucy too far in their relationship. Check out the two preview clips below to see Sheldon draw a humorous Star Trek analogy. "The Bon Voyage Reaction" episode of The Big Bang Theory airs on Thursday, May 15 starting at 8 PM ET on CBS.