I have a feeling the explanation will be lacking. But I suppose I should isntead be wondering why they look like that, rather than get angry at why they look like that. But knowing producers nowadays, I'm very cynical about the explanation and if there'll be one.
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You mean Galaxy Quest? MacFarlane is pretentious as hell, incredibly unfunny and a mediocre actor. Just listen to that freaking dialogue. It makes me cringe. It's so, so bad. It's embarrasing.
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And the Klingon ship they come across in TNG that's also been asleep since the first war with the Federation.
And still very different from the one Worf de-evolved into.