As Cole tries to capture the remaining lifeforces he loses his memory and Mel races against time to restore it.
Nestov double-crosses Cole and takes away his alien powers, but Cole escapes to face off against Zin in an ancient alien vault.
Cole discovers Zin has posed as a scientist to gain access to a government facility dealing with aliens.
Escaped criminals from other planets set up shop in New York and an interplanetary police tracker (Adrian Paul) is sent to capture them.
Cole infiltrates the Chicago mob as a hit man, then is expected to kill Detective Vic Bruno.
Cole goes under cover as a patient in an asylum to gain access to an alien who has taken over the body of another patient.
A bar customer is murdered while Mel, Cole, Detective Bruno and Nestov are stuck in the Watchfire during a major snowstorm.
Cole and Mel pose as a married couple at a relationship retreat where they suspect two Orsians are hiding.
A child who recovered from cancer and has the power to heal others is actually a Cirronian scientist.
Cole and Mel go under cover at an event held in an art gallery.
Cole helps an American Indian investigate the suspicious death of his grandson.
Zin frames Cole for murder, but Mel comes to his rescue.
Government alien hunters capture Cole while he attempts to release Kruce, an ally of Zin.
Cole and Mel are after an alien who took over the body of a 15-year-old boy and is luring homeless teens to his lair.
Cole transforms himself into Rod Archer, an ex-boyfriend of Mel's who disappeared two years earlier.
Zin's bodyguard enters the body of a German shepherd which has extraordinary strength.
An alien is spreading a deadly disease to women he seduces.
When he realizes he has inhabited the body of a kidnapper, an alien con artist enlists Cole's aid to prevent a killing.
Cole tracks Raahm to the site of an alien crash in Roswell and the secret airbase where the wreckage is supposed to be hidden.
Cole tracks an Enixian drug dealer who peddles a form of alien ecstasy with deadly consequences for humans.
Cole (Adrian Paul), an alien, comes to Earth to track fugitives from his planet who have taken over the bodies of humans.