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You know what they say about assumptions...
(startrek.website)
Star Trek memes and shitposts
Come on'n get your jamaharon on! There are no real rules—just don't break the weather control network.
But only the first actor?
Depends on the character, but usually the first one has the strongest effects, yes. It's not out of the question for later actors to do the same thing, but very often in recastings like Sulu, the latter actor will emulate the former — to a degree at least.