Following his adventures in the Los Angeles of the 1980s, Jack Deth (Tim Thomerson) has returned to his own time, the 23rd century. Having lost his first wife Lena, and finding out that he's lost his other wife Alice to none other than Harris, Deth agrees to another assignment in the past.
While heading out for another assignment, something (a Solonoid from a previous assignment) hiding in the time portal causes the TCL chamber to go awry. Jack finds himself in a whole new dimension, a kingdom of the technological level of medieval Europe. The physics of this world render most of Deth's technological devices nonfunctional Here, he meets a parallel to Trancers called Nobles, who subsist on the life force of the mortals indigenous to this world.
Jack assists a rebel group known as the Tunnel Rats, who desire to overthrow the villanous Lord Caliban (Clabe Hartley). The leaders of the Nobles' son, Prospero (Ty Miller) rebels against the other aristorcrats. To stop the Trancers of this world, and return himself to his own dimension, Jack must quest to find the mystical Diamond in the Castle of Unrelenting Terror, an item which Lord Caliban is also hunting. The movie ends on a cliffhanger.
Trancers 4: Jack of Swords was made in 1994; shot back-to-back with Trancers 5: Sudden Deth.
The role of Lord Caliban is played by Clabe Hartley.