The Big Bang Theory Season 7 spoilers on Star Wars' actors appearances and big Sheldon/Amy Valentine's Day moment

The Big Bang Theory returns with another Season 7 episode on Thursday, but we're looking down the road a bit with not one, but two juicy spoilers about some upcoming installments.

Firstly, MStars reported earlier in the week that both James Earl Jones and Carrie Fisher would guest star as themselves on television's most-watched comedy when they cross paths with Sheldon (Jim Parsons). But we didn't know why, until now. The following comes from the "Ask Ausiello" column at TVLine, the site that first broke the Star Wars news:

"Question: The force is with you, Aus, for bringing us the scoop on The Big Bang Theory's big Star Wars episode. Well done. Now tell us what leads Sheldon to cross paths with Darth Vader and Princess Leia. -Diego
Ausiello: A Comic-Con crisis sets the stage for the epic run-in. 'The guys for the first time get locked out of getting Comic-Con tickets and they're not going to be able to go,' explains exec producer Steve Molaro. '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.' (And where Vader goes, Leia follows.)"

Of course Sheldon would start his own comic convention. How he lands James Earl Jones is beyond me, but we'll find out soon enough.

If that weren't enough, TVLine also reported that Sheldon and Amy would have a big moment in the show's Valentine's Day episode:

"Question: I hear something big happens between Sheldon and Amy in Big Bang's Valentine's episode. Know anything? -Joyce
Ausiello: Molaro confirms that the slow-burn couple 'have quite a moment' in the installment, which finds Sheldon/Amy and Howard/Bernadette enjoying a romantic double date on a train to nowhere. Elaborates fellow EP Bill Prady: 'We keep dealing with the immovable object that is Sheldon and the irresistible force that is Amy, and inch-by-inch she moves things along.'"

Could a kiss be in the couple's near future? With Sheldon, anything remotely resembling human behavior qualifies as big, so it's tough to tell.

What do you think, Big Bang fans? Let us know in the comments below.