Seeking revenge on Tarzan, Clayton's sister (or rather her valet, Hobson) kidnaps Jane, Tantor, Terk and the Professor, placing each in a separate, deadly peril. She then injects Tarzan with a fatal poison (via blowdart) and informs him that the antidote lies far away on a distant mountain she's dubbed "Clayton's Peak". He, therefore, has a choice, she says – to suffer as she had (and lose those he loves) or as Clayton had (and lose his own life).
- In this episode, it's revealed that Clayton has a sister, Lady Watham.
- This episode has a flashback to Tarzan and Clayton's fight but in cartoon form.