Cliffhangers was an interesting experiment: an attempt to revive the thrills and drama of the old movie serials. It featured three segments: The Secret Empire, The Curse of Dracula, and Stop Susan Williams. Of the three, The Secret Empire came closest to replicating an old Republic serial; namely, the Gene Autrey serial The Phantom Empire.
The time is the 1880's and the place is Wyoming. The story opens (seemingly in progress) with Marshal Jim Donner in pursuit of the Phantom Riders, black-clad criminals who have stolen gold shipments. The riders disappear into a mountainside. With the help of young orphan, Billy, the marshal locates the hidden entrance to a cave. He also opens a door to an elevator, which takes him to Chimera, a fantastic underground city. He assists Maya, the daughter of the deposed ruler and leader of a resistance movement. He aids in the fight against the evil Thorval, and his seductive daughter Tara. Thorval has an above ground accomplice, Jesse Keller, and the Marshal is aided by Billy and Millie, the female doctor.
The series was typical of the old serials, with fast moving plot, evil villains, seductive femme fatales, and chaste heroines. The above ground elements were filmed in black and white, while Chimera appeared in color.
Geoffrey Scott made a great hero, part Flash Gordon, part Matt Dillon. He plays the hero well, if not with great depth. Star Trek's Mark Lenard is Thorval. He plays it straight, with culture and menace, although his lines get a bit hokey. His daughter, Princess Tara is played by Diane Markoff and Stephanie Kramer (from TV's Hunter), the actresses switching after the character undergoes a transformation. Markoff was the sexier, playing Tara like Princess Aura in Flash Gordon (including a direct homage to one of Flash's escapes). Pamela Brill is the rebel leader Maya, the platonic heroine. Carlene Watkins is great as Millie, the doctor and potential love interest for the marshal. Tiger Williams, who plays Billy, is a typical child actor. Peter Breck (The Big Valley) is a hoot as Jesse Keller. He plays him over the top, but never descends into camp. He has some of the best scenes.
The final chapters were never broadcast in the US, but they were produced. The Marshal helps free the resistance and leads them against Thorval's Shadow Guards. Thorval is defeated and escapes to the stars (in Buck Rogers' Ranger 3 spacecraft). Billy is adopted by Maya and stays in Chimera, while Millie and Marshal Donner return to Cheyenne.
The series was great fun, with some decent stuntwork, especially in the unaired final two chapters. The dialogue is rather hokey and Chimera looks like it is a mall, with plenty of sub-basements and maintenance corridors. The initial matte paintings, seen as the elevator descends, were far more interesting. Given a greater budget and a little tweaking of the script, the series could have been great. As it stands, it's entertaining.