The original Galaxy Quest movie ended with the launch of a new TV series called Galaxy Quest: The Journey Continues, which saw the main cast members reprising their roles, as well as Sam Rockwell’s Guy Fleegman and Missi Pyle’s Laliari playing new characters.
As for Alan Rickman’s character, evidently the plan is to recast the role rather than remove the character from the story.
And judging by Sigourney Weaver’s comment, it sounds like Tony Shaloub, Sam Rockwell and others would also be game to return alongside her and Tim Allen.
But if Galaxy Quest is following in the footsteps of the Star Trek franchise, then it makes sense that over two decades later, there’d be a new show, either on a traditional channel or a streaming service, starring a completely new cast of main characters, with the original cast now being looked at as the old guard.