Goof: Gemini prevents Thundarr from utilizing his sunsword by encasing his entire forearm with a magic cast. But afterward, the cast is missing from the point Gemini levitates him toward the Hawkmen until he releases him to a Silicoid.
Passenger: I say turn back. Janus and his hawk mutants are too dangerous. (a few others mutter in agreement)
Thundarr: Who is this "Janus"?
Tye: The clown in the silver wrappings. He leads the hawk mutants on their raids.
Ariel: Be reasonable, Tye. You can't risk your passengers' lives.
Tye: What about the villages that depend on my train for supplies? (Ookla growls and walks away)
Thundarr: Which you sell for a tidy profit.
Tye: Even former swamp urchins have to eat, Thundarr.
Tye: The engine's still in one piece. Luckily, I can fix the damage.
Ariel: The more work is getting it back on its tracks.
Tye: Oh, I think those two can handle it.
(Thundarr and Ookla struggling as they tow the train engine with rope)
Thundarr: I would rather...deal with ten Geminis than that stubborn swamp urchin. (Ookla growls in agreement)
This episode is likely set in an unspecified location in Central America.
With this episode, Tye and Gemini are the only recurring characters in this series. The latter previously appeared in Secret of the Black Pearl and the former in Harvest of Doom, the show's first two episodes.
In this episode, Janus/Gemini is assisted by two Post-apocalyptic humanoid species; Hawk mutants who serve as his warriors and Silicoids, composed mainly of rock, who were willing to do Gemini's bidding to gain revenge on Thundarr. Hatched from eggs, the Silicoids are in a very weak form in infancy, but bathe in a special pool that hardens their bodies, strengthening them in the process. They're significantly much stronger when they reach adulthood. However, if non-Silicoids are immersed in this pool, they will be permanently encased in coatings of stone that are impervious even to magic.
In this episode, Ookla reads an issue of SlimeBoy from the Marble Comics Group. The company name is a take on Marvel Comics, which is famous for several superheroes from Iron Man, The Fantastic Four, X-Men, Blade, The Incredible Hulk and The Amazing Spider-Man.