An obsessive, insubordinate homicide cop is convinced a serial killer is loose in the Hollywood area and disobeys orders in order to catch him.

Officer Carey Mahoney and his cohorts have finally graduated from the Police Academy and are about to hit the streets on their first assignment. Question is, are they ready to do battle with a band of graffiti-tagging terrorists? Time will tell, but don't sell short this cheerful band of doltish boys in blue.

When police funding is cut, the Governor announces he must close one of the academies. To make it fair, the two police academies must compete against each other to stay in operation. Mauser persuades two officers in Lassard's academy to better his odds, but things don't quite turn out as expected...

A new batch of recruits arrives at Police Academy, this time a group of civilian volunteers who have joined Commandant Lassard's new Citizens on Patrol program. Although the community relations project has strong governmental support, a disgusted Captain Harris is determined to see it fail.

Aliens disguised as clowns crash land on Earth in a rural town to capture unsuspecting victims in cotton candy cocoons for later consumption.

Local teenagers are holding a Halloween party at a supposedly "haunted" old mill, but find out that one of the partygoers who is dressed as an alien is actually a real alien.