Siporta, the space conqueror, has captured the only being in the universe that can stop him: the Canon Robot. Unable to control it, he decides to melt it down and use the parts to create his own combat robot. Now the people of Earth are in a race against time to save the Canon Robot from destruction so that they can use it to defeat the otherwise invulnerable Siporta.
When a bumbling pair of employees at a medical supply warehouse accidentally release a deadly gas into the air, the vapors cause the dead to re-animate as they go on a rampage seeking their favorite food: brains!
As graduation nears for the class of 1955 at Angel Beach High, the gang once again faces off against their old enemy, Porky, who wants them to throw the school's championship basketball game since he has bet on the opposing team.
The Griswalds win a vacation to Europe on a game show, and thus pack their bags for the continent. They do their best to catch the flavor of Europe, but they just don't know how to be be good tourists.