KILLER KLOWNS FROM OUTER SPACE

Just outside the small town of Crescent Cove, Mike Tobacco and his girlfriend Debbie Stone are spending time at the local lovers' lane when they witness the arrival of a strange glowing object. Nearby, a farmer, perceiving it as Halley's Comet, ventures into the woods to find the impact site. He eventually stumbles upon a circus tent-like structure, during which he is captured by clown-based extraterrestrials known as "Klowns". Arriving to investigate for themselves, Mike and Debbie enter the structure and discover a complex interior with bizarre rooms, eventually realizing that it is the object and a spaceship. They find the now-fleshless farmer encased in a cocoon made out of a cotton candy-like substance and are discovered by a Klown, which shoots popcorn at them from a bazooka-like weapon and then pursues them aided by other Klowns.

Narrowly escaping to the local police station, they report the incident to Debbie’s ex-boyfriend Officer Dave Hanson and his curmudgeonly partner, Curtis Mooney. Mike takes Dave to the site of the ship, only to find it missing with a large crater left in its place, prompting Dave to apprehend Mike for his supposed tall tale. The duo then visit the lovers' lane, only to find it abandoned and one of the cars filled with the cocoon's substance, proving the Klowns' existence and Mike's innocence. All the while, the Klowns are seen encasing townspeople in more of their cocoons using toy-like rayguns. Several of them pull pranks and mock circus acts, which result in the deaths of several onlookers.

Mike and Dave eventually witness a Klown using a form of shadow play to shrink a crowd of people at a bus stop, then dump them into a bag filled with popcorn, which are later revealed to be its species' larval form. Back at the police station, another Klown arrives and Mooney, believing it to be a delinquent, attempts to incarcerate it. Dave soon returns to the station and encounters the Klown using a deceased Mooney as a ventriloquist's dummy before shooting its fragile nose, which causes the Klown to spin around wildly and explode into confetti.

Mike meets with his friends, Rich and Paul Terenzi, and, using the public address system on their ice cream truck, drive around town attempting to warn people of the Klowns. At Debbie's house, some of the Klowns' larvae from her and Mike's earlier encounter with them evolves into juvenile Klowns and attacks her. As she attempts to escape, she is intercepted by the other Klowns, who detain her in a giant balloon. Mike, the Terenzi brothers and Dave witness Debbie's capture and give chase, following the Klowns to the local amusement park, where they have relocated their ship. Journeying through a funhouse, the Terenzis become separated from the group. After Dave and Mike infiltrate the ship and witness a Klown drinking the blood of one of their cocooned victims, they rescue Debbie and flee deeper into it.

The trio find themselves surrounded by a legion of Klowns, but the Terenzis arrive in their ice cream truck and attempt to distract them. The Klowns' gargantuan leader, Jojo the Klownzilla, appears and destroys the truck, seemingly killing the brothers. Dave creates a diversion as Mike and Debbie escape before the ship begins to take off. He then uses his badge to shatter Jojo's nose, vanquishing it and destroying the ship. The Klowns' car drops out of the sky and Dave emerges along with the Terenzis, the latter of whom miraculously survived by hiding in the ice cream truck's freezer moments before it was destroyed. As Dave, Mike and Debbie watch the fireworks created by the ship's destruction, pies fall from the sky and land on their faces.

After following the Klowns to the amusement park, Mike, Dave, and the Terenzi brothers confront the alien threat, rescue Debbie, and battle the Klowns, leading to the destruction of their spaceship.

The finale pits the survivors against the bizarre invaders in a chaotic funhouse showdown, blending over-the-top sci-fi action with slapstick horror. The defeat of the Klowns and the destruction of their spaceship offer closure and a return to small town normalcy—at least until the next otherworldly carnival rolls in.