Having been "tagged" by Jixen slime, Starkey is in hiding from The Department and from the Jixen warrior who survived K9’s blast. Jorjie tells Starkey that the Department is imprisoning Aliens, and K9 flies off to investigate. Jorjies’s mother turns out to be Department inspector June Turner, and there is a confrontation as the youngsters and K9 try to help release the innocent Aliens. Starkey confronts the Jixen with dire consequences.

Starkey is homeless and K9 and Jorjie try to help. Gryffen’s assistant Darius contacts them after the Professor, an agoraphobic, disappears from the mansion. A warning from the 50th century is received, and K9 and the youngsters give chase to a mind-sucking alien called the Korven, who has snatched Gryffen.

K9 becomes confused about his memory loss when an alien "bounty hunter" arrives and teams up with an evil Department inspector called Drake. Ahab, the Bounty Hunter, claims there is a price on K9’s head for murdering a galactic peace delegate in the 50th century.

Drake uses a strange alien substance on a group of school children in an experiment to gain control of the population. Jorjie stumbles across the plan, and K9 and Starkey have to find and destroy the control devices.

London is out of control; riots erupt due to irrational fear. The focus of the paranoia is based in an old junkyard where a strange alien consciousness is at work. K9 discovers the emotion of fear for himself in his bid to thwart the unknown.

Darius, Starkey and Jorjie spend a very spooky evening at Gryffen’s mansion, as spectres from Gryffen’s past materialise, causing mayhem. K9 sees the "ghosts" for what they really are, and the group have to convince Gryffen before the youngsters' life forces are drained away so that the alien energy beings can take physical form.

Inspector Drake is attacked by K9, or so it seems. June Turner and the Department have orders to capture K9 and destroy him. However, Starkey discovers Drake has had a basic double of K9 built to discredit him.