At the end of The Stepfather (the first film), Terry O'Quinn's character (Jerry) was shot by his wife and stabbed in the chest by his stepdaughter, then fell down a flight of stairs. Stepfather II is operating under the premise that Jerry survived that attack and is now undergoing psychiatric treatment in a mental institution. It is two years later - Jerry is balder and wearing thick glasses...
Herein lies a totally enjoyable combo-movie - an amalgam of Alien and The Thing, but taking place underwater, rather than in space or in the snow. There are huge, ridiculous weapons, as well as...