Galaxy Quest celebrates its 20th anniversary this Christmas but Christmas comes a little early because a new 20th anniversary steelbook Blu-ray is available at Walmart now. The film starred Tim Allen, Sigourney Weaver and Alan Rickman as the stars of a sci-fi show who get called upon by real aliens to save the universe.

The cast and filmmakers got together to record bonus features for the film’s 10th anniversary DVD release. Those bonus features are included on the 20th anniversary and they still hold up. Here are a few things you can learn from the Galaxy Quest Blu-ray.

Alan Rickman was originally the villain of ‘Galaxy Quest’

Alan Rickman plays Alexander Dane, an actor who resents his catch phrase on the show. In David Howard’s original script, Dane became the villain.

“In my draft the villain is really the Alan Rickman character,” Howard said. “He’s written all these sci-fi novels and made a lot of money and he has decided he’s going to discover the real thing out there. So he goes out and he starts doing all these crazy experiments and he opens this rift in time and space and goes to this planet. He kind of establishes himself as Ming the Merciless.”

Sigourney Weaver’s F word was cut

Sigourney Weaver plays Gwen DeMarco, the show’s sexpot who is hardly Ripley when she goes into space for real. When she encounters the chompers in the bowels of the ship, Gwen originally exclaimed the F word.

Director Dean Parisot and screenwriter Robert Gordon said she had to dub over it with “screw this” for the film to keep its PG-13 rating. You can still see her lips say the F word. 

Tim Allen wasn’t doing Captain Kirk in ‘Galaxy Quest’

Tim Allen played Jason Nesmith, the TV captain who gets to be captain for real. Allen said he met William Shatner who assumed Allen was doing an impression of him, but Allen’s inspiration dates back even further. He was doing Yul Brynner in The Ten Commandments. 

“Moses, Moses, Moses, what do you bring me dressed in the garb of Hebrew slave,” Allen quoted in a Yul Brynner voice.

Tim Allen acted like a jerk to get into character

Jason Nesmith was supposed to be resented by his costars for his behavior on the show, so Tim Allen went a little method.

“I would annoy these other actors purposely as the character because I think it’s impossibly weird that there are people like this,” Allen said. “There are stars that don’t want extras looking at them. Are there seriously people like that?”

Sam Rockwell played a guest star who finagled his way into the crew’s adventure. He backed up Allen’s story. 

“He would come into the makeup trailer and they’d be too busy for him or something and he’d go, ‘That’s okay. I’m just number one on the call sheet. No problem, just number one on the call sheet,’” Rockwell said.

Tim Allen insisted on detail

Galaxy Quest was a sci-fi comedy, but Tim Allen still wanted to get it right.

“I was this freak for details,” Allen said. “You can’t just land the stupid ship on the planet. Somebody’s gotta tricord or something. We gotta test the oxygen level. So we did that whole scene with Rockwell. He took that line. ‘You can’t just open the door. Somebody’s gotta test the air.’”