Jim awakens one morning to find that his cranium has more than doubled in proportion. Initially embarrassed, it takes Jim nearly a week to leave his apartment, and his first stop is a head specialist. But good Dr. Axel can offer no solid answers, so an irritated Jim heads out the door for home. On his way, he's cornered by a gang of thugs, who have absolutely no idea what's awaiting them. Jim's head splits in two and out jumps a little purple alien who attacks them. After beating up the aggressors, the alien pops back into Jim's head, which seals up behind him. Dumbfounded, Jim heads home and interrogates the alien. Turns out his name's Roy, and he's on a mission to save the Earth from a parasitic alien named Gork. Dr. Lucas Elliott, a disgruntled FBI agent, catches the thugs telling their story on Eye Witness News, and begins his pursuit of Jim.

Jim had forgotten that he had set up a date with Madelyn, which Roy encourages him to keep.

Jim awakens to find that Madelyn has been possessed by Gork. Roy explains that the Gork race has made plans to invade the heads of Earthlings, and he came to Earth with a machine that could stop the invasion -- but it was broken into five pieces and scattered across the planet. Meanwhile, Dr. Elliott bursts in with his cronies to interrogate Dr. Axel. He tells of his childhood encounter with a Gork, then proceeds to kidnap the head specialist.

Roy spies the first piece of the anti-invasion machine lodged in the face of the Statue of Liberty. Roy hops on the Staten Island Ferry to retrieve the piece, but he finds himself hunted by sightseers who think he's an alien California Raisin. Meanwhile, Jim goes to a meeting of ""human anomalies"" and befriends the group -- but Jim and Roy's telekinetic link cuts their meeting short when Jim receives a cry for help. Jim enlists the anomalies' aid to help him save Roy from the angry mob.

Roy uses his telepathic abilities to find the next piece of the anti-invasion machine. He locates it in a jungle. So Madelyn, Jim and Roy are off to the forest, where their plane goes down and they're pursued by headhunters. Meanwhile, Gork convinces Dr. Elliott that the machine he has is to locate the other alien race's weapons.

Jim and Roy are off to the small town of Shallow Ditch to recover another piece of the anti-invasion machine, as Elliott's FBI cronies are searching the sea for the black orb, the last piece. Jim finds himself playing King Arthur as he tries to pull the key (shaped like a sword) from a stone.

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After a near-death experience whilst trying to get the orb, Elliott's henchmen blow him off and head to a cabin by the lake with the orb. Elliot becomes infuriated and Gork becomes increasingly deceptive. Roy discovers the location of the orb, so he and Jim set out to get it -- then wind up nearly getting blown up in the cabin by the lake.

Jim and Roy hide the orb, but Dr. Elliott has his sights set on finding it. So when they reveal to the group that ""Einstein knows where it is,"" Elliott's spy leads him to it. Meanwhile, Roy finds a mutual attraction with Mona, so he spends a romantic evening at her house, where he learns that she has a tail... and that she's Elliott's spy. The evening ends with Elliott busting in and taking Roy prisoner.

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Now that Roy's been captured, Jim's skull has returned back to normal size, but his equilibrium is out of whack. So Jim pays a visit to Dr. Axel, who offsets the equilibrium damage by strapping an anvil to Jim's head. Meanwhile, Mona arrives declaring that she's in love with Roy, and she wants to help him escape from Elliott's evil clutches. So the anomalies and Dr. Axel set off to break Roy out of the FBI building. Meanwhile, Gork tries to convince Dr. Elliott that he's the good alien and Roy is the parasitic alien.

As the anomalies prepare to rescue Roy, the Gork race prepares their invasion. But as Jim and the gang enter the compound, Gork escapes with the orb inside Dr. Elliott's head. Meanwhile, Ray learns that the lawnmower blade that's embedded in his skull wasn't an isolated case.

In a final confrontation with the brainwashed Feds and Evil aliens, Jim's team dominates and stops the alien invasion.

Seeking fame and fortune on the Spoken Word Circuit, Jim sells his soul to the Devil in return for earthly success. Roy and Madeline risk eternal damnation and challenge the Devil to a double-or-nothing battle in hell.

Suffering from terrible nightmares, Chin travels to China to learn why his parents abandoned him, but he is captured by the evil Mr. Chang and forced to fight in the Battle of the Freaks Competition.

After taking a chance on a Personal Ad, Raquel is swept off her feet by a charming Siamese twin. Blinded by love, Raquel doesn't see that she's simply being used.

A simple fishing trip is met with disaster. Will John and friends manage to get things together before piranhas strike?

Roy's brother visits from outer space, he may not have come alone and when a jar of anti-matter is discovered missing, the problem it causes extends beyond the planet earth.

Madeline has a great job as foreman on a huge construction project, but there's trouble underfoot - in the form of thousands of giant rats.