Thundarr The Barbarian faces a very odd foe in the episode, "Stalker From The Stars".
A spider-like space vampire lands on 40th century Earth, and begins capturing human prey to take back home for food. One of his victims is Princess Ariel, and for Thundarr (Robert Ridgely) and a flu-ridden Ookla (Henry Corden), that makes it personal.
The quirk in the script is obvious in the final part. Earlier, the Stalker had webbed up Ariel's hands to block her magic, but she seemingly has magic powers throughout her body. One simple kick frees her hands. Later, after being completely coccooned, Ariel is able to get herself out by making the coccoon disappear, when Thundarr wasn't able to penetrate the alien webbing to save an elderly man. The easy excuse is that the Stalker caught Ookla's cold, which weakened the strength of his webbing as the story went on.
Edit, 9/25/18: As it happens, the Stalker wasn't the only one to catch cold. So did Ariel at the end of the show....