I don’t recall at the moment if this started as a direct remake/sequel to Fantastic Voyage, was merely inspired by it openly, or just has a similar concept, but I do know that I was first made aware of the existence of Innerspace when researching Voyage. I have dim recollections that it might be a “suggested by” treatment of the novel sequel to Voyage?
Anyway, I also just discovered it has Martin Short as the hapless fellow who doesn’t realize he’s got a tiny explorer inside him, which ramps up my interest in it. Also, the idea of cutting back to comedy sequences outside caused by what’s going on inside reminds me of Osmosis Jones, only with live action/VFX instead of cartoon animation.
I’m not sure if Matilda is intentionally being invoked by the posters, or if it’s more of a coincidence of starring Mara Wilson and having a 90s “whimsical fantasy” aesthetic. The story isn’t much like Matilda at all really.
Anyway, the poster design wouldn’t have gotten me interested (I think I liked Matilda, but if I wanted to see it again I could just see it again. Actually, I ought to see it again), but it’s again in the big, cheap collection of movies I recently got, and the description on IMDB shows potential. But what really got me interested was the tagline. “Anabel made a wish. Murray made a mess.” That’s almost certainly an oversimplification, but it suggests a fun, haphazard style of accidental magic.