BTTF is one of the movie series you just have to revisit every now and then. Part 2 is a bit less lighthearted than its predecessor, but the plot requires it: Marty and his family are in considerable peril at the hands of vile Biff Tannen (Thomas F Wilson is as effective a villain as Fox is a good guy) and it takes complicated procedures in order for them to prevail--but Marty and the doc are nothing if not persistent. They handle time-warping easily, although it can be a challenge for the viewer: where the heck are they NOW??? But pay attention. It's worth the watch, if only for the special effects and the mentor/mentee chemistry between Fox and Lloyd. A fun time at the movies.