Tom & Jerry get mixed up with a washed-up superhero, Supercape (Don Messick), in this 1975 short. Supercape, of course, is a parody of Superman. John Stephenson narrates and voices the police chief. The narrative, ironically, is another parody, this one of Dragnet, which Stephenson served as an announcer for a few years prior.
Edit, 1/6/16: Unfortunately, the video was pulled by YouTube. Dailymotion has a foreign language version that we can't use, so we'll settle for this sample clip from Cartoon Network UK.