Eccentric Frank Carlyle ran a horror shop in small-town Steeple Falls, which takes pride in and profit from its Halloween traditions. Frank's widower grandson Richard grudgingly returns there from Boston with his own kids, bright Ian and bratty Claire, to settle the inheritance. Ian discovers great-grandpa's house is really haunted, and not just, as legend holds, by historic owner Zachariah Kull, who was burned on the stake.

An amphibious shark-like monster attacks an abandoned secret military base and the people who live on the island.

In the midst of WWII, a group of half-witted soldiers lead by a slightly smarter sergeant, battle the Germans and especially Von Kraut in the desert.

An accident-prone and obnoxious geek joins a NASA space mission to Mars. During the flight, he manages to put himself and the entire crew in jeopardy, but is in danger of emerging as a hero when his new colleagues need him to save them from the unforgiving surface of the red planet.