Several actors who have had roles on various Star Trek television series and films have commented on Galaxy Quest in light of their own experiences with the franchise and its fandom.

Jonathan [Frakes] told me to see it. I said I didn’t want to see the piss taken out of me by Alan Rickman and the rest. He told me to see it in Santa Monica on a Saturday night. I did, and it was perfect, fantastic, one of my all-time favourites. They got it exactly right – that’s how it was, and the ending was right at the heart of the spirit of Star Trek.

— Patrick Stewart (Jean-Luc Picard on TNG)[8][29][30]

I’ve had flashbacks of Galaxy Quest at the many conventions I’ve gone to since the movie came out. I thought it was an absolute laugh-a-minute.

— Tim Russ (Tuvok on Voyager)[31]

I thought it was very funny, and I thought the audience that they portrayed was totally real, but the actors that they were pretending to be were totally unrecognizable. Certainly I don’t know what Tim Allen was doing. He seemed to be the head of a group of actors, and for the life of me I was trying to understand who he was imitating. The only one I recognized was the girl playing Nichelle Nichols.

— William Shatner (James T. Kirk on TOS)[32]

I loved Galaxy Quest. I thought it was brilliant satire, not only of Trek, but of fandom in general. The only thing I wish they had done was cast me in it, and have me play a freaky fanboy who keeps screaming at the actor who played ‘the kid’ about how awful it was that there was a kid on the spaceship. Alas.

— Wil Wheaton (Wesley Crusher on TNG)[33]

Yes, I have seen Galaxy Quest and no, it’s not really like that.

— Casey Biggs (Damar on DS9)[34]

I think it’s a chillingly realistic documentary. [laughs] The details in it, I recognized every one of them. It is a powerful piece of documentary filmmaking. And I do believe that when we get kidnapped by aliens, it’s going to be the genuine, true Star Trek fans who will save the day. … I was rolling in the aisles. And [star] Tim Allen had that Shatner-esque swagger down pat. And I roared when the shirt came off, and [co-star] Sigourney [Weaver] rolls her eyes and says, ‘There goes that shirt again.’ … How often did we hear that on the set? [Laughs]

— George Takei (Hikaru Sulu on TOS)[10]

Galaxy Quest - Wikipedia