Tracker

218 violent criminal aliens land on Earth in the form of "life forces" and take over the various human bodies on a train. Cole, an alien, and Mel, a human, team up to capture them.

An alien drugs Mandy and she end up hospitalized. Meanwhile Mel and Cole continue to investigate the fugitives.

Outside of Rosewell, a man and waitress debate the reality of fabeled crash. Leaving with a map to the site, the man finds aliens do in fact exist. In the meantime, Cole tracks the alien's brother to Roswell.

Cole chase an Inixian who holds the much-needed blaster and life force collector.

In Chicago, countless women are suddenly suffering from a mysterious illness, spread by an alien through seduction. Cole, Mel and Nestov find the carrier of the deadly disease

Zin takes advantage of an alien who's taken over a German shepherd, which morphs into a hybrid with superstrength.

Rod (Mel's ex-boyfriend) is charged with the murder of his new partner, but Mel believes in his innocence. Cole transforms into Rod to explore if he was involved in criminal activity.

Cole investigates one of the convicts that has slipped into the body of a missing 15-year-old, Jordan, and is abducting drug addicts and lunatic tramps for use in an alien lab.

Krace is tortured by a secret anti-alien unit in a hidden lab. During the search for Krace, Cole falls into the trap of government alien hunter.

The two aliens murder Joshua and fake his suicide. Joshua's grandfather searches for the assassins while Cole helps American investigate the death of his grandson.

Cole learns that Zareth wants to steal a valuable Egyptian statue at an art gallery event. Mel manages to get them invited, and they must figure out which human she's taken over.

Jemie Swenson suffers from an incurable disease and surprisingly gets healed. Cole finds out a fugitive performing with this miracle of healing.

In search of a pair of Orsians, Cole and Mel pose as husband and wife at a couples retreat, where they learn surprising things about their own relationship during the counseling sessions.

On a stormy winter night, an alien enters Mels house. Cole suspects an alien presence when a murder is committed while Watchfire patrons are trapped by a snowstorm. Mel and Cole tries to catch the intruder, but he flees.

Cole poses as a mental patient to reach Yahir, an alien with information about Zin's master plan, but their meeting doesn't go according to plan.

Zin wants to team up with human criminals. To stop him from carrying out his dangerous plans, Cole poses as gangster Tony.

Cole and Mel find that an alien is headed to London to copy the beastly acts of one of the most famous killers of all time, Jack the Ripper.

Cole keeps searching the Jack the Ripper copycat. The killer attacks Mel while Cole falls into a deadly trap.

The US government remains on the trail of the dangerous aliens. Zin poses as a scientist to enter a government facility that holds information about an alien's interrogation by a doctor years earlier.