Audio problem: Right after the Thermians become sad over the mention of Gilligan's Island, Alexander rolls his eyes and starts to turn away, while you can hear him saying "Oh brother." However his lips are not moving for this indicating the line was dubbed in.
TedStixon
17th Apr 2021
Galaxy Quest (1999)
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Suggested correction: It's quite obviously Laredo/Tommy's voice saying "Oh, brother" off camera. Not Alan Rickman. Their voices don't sound anything alike. You can see for yourself at this clip at about 1:03: https://www.youtube.com/watch?v=26tWWopd_3g.
Suggested correction: It is not Alexander who says it, but most likely Guy.
No it's Alan Rickman's voice.
It's definitely not Alan Rickman's voice. It's Tommy/Laredo's voice off camera saying the line.