When Roxton is running from a tyrannosaur, the earth suddenly swallows him up; the party follows a river to an underground ocean.

Stung by a giant bee, Summerlee lies near death; Challenger seeks a way to repel an attack by the ape-men.

In order to free Challenger from her tribe, the team must retrieve the bones of a warrior queen's husband.

Christecs brand Summerlee a devil after he revives a drowning child.

A vampire bite elevates Roxton's hunting instincts to a bloodthirsty level; a smitten native will fight Malone to the death for Veronica.

A search for Veronica's parents leads to a paradise guarded by prehistoric creatures and filled with beautiful, talented immortals.