1958's War of the Colossal Beast was a direct sequel to "The Amazing Colossal Man." Sacrificing a lot of the first film's lead character's sense of humanity, the sequel featured a lot more stomping and such.
Brides of Dracula (1960) is one of my favorite Hammer vampire films…ever. Peter Cushing returns as Van Helsing the vampire hunter. He even suggested the film's fantastic ending - a face-off between Van Helsing and the vampire (David Peel) featuring branding irons, holy water and a flaming windmill. (You'll have to see it.)
Aka "The Chosen," this film takes the "my son, the anti-Christ" theme, mixes it with several other sci-fi cliches (Dad works at a middle-eastern nuclear power plant - what could go wrong?) and blends them out of existence.
Roger Corman's inventive film about LSD was written by Jack Nicholson and starred Peter Fonda and Dennis Hopper in their pre-"Easy Rider" days. If you can read this poster, you're a 60s kinda person. (1967)
Son Of Frankenstein (1939) Boris Karloff, Basil Rathbone, Bela Lugosi. While not the best of the original series, the movie was given an almost surreal look via its art design by Jack Otterson and set work by Russell A. Gausman, harkening back to the German expressionism of the 1920s.