Highlights from the Fifth Episode of Season 5 of The Big Bang Theory

Its a Trekkie Reunion on The Big Bang Theory when Sheldon's rivial Wil Wheaton returns along with Brent Spiner.

Sheldon and Leonard get invited to a party at Wil Wheaton's house, and Howard (Simon Helberg, left) gets an out-of-this-world opportunity - which Bernadette (Melissa Rauch, right) is less enthusiastic about, on THE BIG BANG THEORY

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Sheldon (Jim Parsons, center) and Leonard (Johnny Galecki, left) get invited to a party at Wil Wheaton's (right) house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY

heldon (Jim Parsons, second from the left) and Leonard (Johnny Galecki, second from the right) get invited to a party at Wil Wheaton's (far left) house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY.

heldon (Jim Parsons, second from the left) and Leonard (Johnny Galecki, second from the right) get invited to a party at Wil Wheaton's (far left) house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY.

heldon (Jim Parsons, second from the left) and Leonard (Johnny Galecki, second from the right) get invited to a party at Wil Wheaton's (far left) house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY.

heldon (Jim Parsons, second from the left) and Leonard (Johnny Galecki, second from the right) get invited to a party at Wil Wheaton's (far left) house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY.

Sheldon (Jim Parsons, right) and Leonard (Johnny Galecki, center) get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY.

heldon and Leonard get invited to a party at Wil Wheaton's house, and Howard (Simon Helberg, left) gets an out-of-this-world opportunity - which Bernadette (Melissa Rauch, right) is less enthusiastic about, on THE BIG BANG THEORY.

Sheldon (Jim Parsons, right) and Leonard (Johnny Galecki, left) get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY

Sheldon (Jim Parsons, right) and Leonard (Johnny Galecki, left) get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY

Sheldon (Jim Parsons, right) and Leonard (Johnny Galecki, left) get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY

Sheldon (Jim Parsons, right) and Leonard (Johnny Galecki, left) get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY

Sheldon (Jim Parsons, left) and Leonard (Johnny Galecki, right) get invited to a party at Wil Wheaton's house, and Howard gets an out-of-this-world opportunity, on THE BIG BANG THEORY

Check out this photo of @StarTrek's @BrentSpiner and @wilw with Jim Parsons. Watch them all on @BigBang_CBS tonight at 8/7c on @CBS!