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OTRC: Simon Helberg talks 'Big Bang Theory' finale, says expect a cliffhanger

The cast appears in an undated photo from a scene from the CBS series 'The Big Bang Theory.' (CBS)

"The Big Bang Theory" is about to get serious ... according to one of the show's stars.

The popular CBS sitcom, which is about a pair of nerdy guys and their friends, is gearing up for its Thursday, May 16 season finale -- and the show's star, Simon Helberg, told the Associated Press to expect a cliffhanger.

"This time, the adventure is for Leonard," Helberg said, referring to the experimental physicist played by Johnny Galecki. "Howard finds Stephen Hawking's crew is sending out an expedition to the North Sea, and he gets Leonard a job, going on a boat for four months."

The series, which began airing in 2007, stars Jim Parsons as Sheldon Cooper, Johnny Galecki as Leonard Hofstadter and Kaley Cuoco as Penny -- Leonard's girlfriend. The actor explained the dilemma that Leonard will be faced with.

"The obstacle is Penny and Leonard have never been better," Helberg continued. "So, is he really going to leave her for four months?"

(Check out PHOTOS of the cast celebrating four years at PaleyFest.).

The show, which broke two records with its first episode of the new year, will also see some drama playout between characters Raj, played by Kunal Nayyar, and his love interest Lucy, played by Kate Minucci. While the astrophysicist hopes to further their new relationship, Lucy's character doesn't seem quite up to speed with Raj's.

The show's characters are also set to face some internal troubles, dealing with jealousy among themselves.

"Howard's a little competitive now that Leonard is getting the spotlight, (because) no one cared about Howard being an astronaut," Helberg explained. "So, it creates this sort of ripple effect."

The show also stars Helberg as Howard Wolowitz, and Mayim Bialik, who joined the show in 2010 and earned her first Emmy nod, as Amy Farrah Fowler.

Parsons has won two Emmys for his role in the show, and the series has been nominated a total of 18 times. In 2011, Parsons took home the Golden Globe for Best Performance by an Actor in a Television Series - Musical or Comedy for his work as Cooper.

In January 2011, it was announced that the scientific comedy had been renewed for 3 more seasons and would air until at least 2014.

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