"The Big Bang Theory" will return with an all-new episode featuring special guest star James Earl Jones this week.

In addition to Jones, who is renowned for playing the voice of Darth Vader, Carrie Fisher, another "Star Wars" alum (Princess Leia), will also make a guest appearance on the upcoming episode titled "The Convention Conundrum." Both actors will be playing themselves and will cross paths with Sheldon as he tries to organize his own comic book convention.

According to the official synopsis, Sheldon has a "wild night" with Jones.

"After the guys can't get Comic-Con tickets, Sheldon tries to hold his own convention and winds up spending a wild night with James Earl Jones. Meanwhile, the girls see if they can act like 'grown-ups.'"

"The guys for the first time get locked out of getting Comic-Con tickets and they're not going to be able to go," explained executive producer Steve Molaro to TV Line. "So Sheldon sets out to start his own new comic book convention and is hell-bent on getting an A-list panelist. If he gets one, it will be a real convention, and he sets his sights on the voice of Darth Vader."

A number of hints have also been released concerning the show's Valentine's Day episode including "Lost" star Tania Raymonde's guest appearance as Raj's new love interest. Raymonde will debut in next month's Valentine's Day episode playing a cute and somewhat surly veterinarian who ends up taking care of Raj's sick dog Cinnamon.

"Leonard and Penny are watching Raj's dog Cinnamon, and they nearly poison her and kill her. So they all spend Valentine's Day in the vet's office trying to make sure Cinnamon is OK. And the vet might be a cute young lady," Molaro told TVLine.

"The Big Bang Theory" S7E14, "The Convention Conundrum," will air on Thursday, Jan. 30 at 8 p.m. on CBS.

Watch a preview below.