It's actually a very dark movie for Disney, and one of my favorites. Great cast, great soundtrack (main theme & credits are stellar), has a very fast pace (opens with the discovery of the black hole and no introduction), some great visuals (meteor in the bulkhead tube), and one of the most hauntings ending shots of all time (the merge). Of note is it also stars Yvette Mimieux who was in the original Time Machine with Rod Taylor.