Mark must surrender himself to Mr. Shubert to keep him from melting the polar ice caps.

An invention designed to collect material from the ocean floor develops a mind of its own and threatens to destroy all sea life.

Mark and Mr. Shubert's daughter recover a dangerous statue.

A whirlpool transports Mark to another world and he finds Muldoon trying to steal the gold from it.

Mr. Shubert tries to extort money by threatening to unleash a giant jellyfish on a swim meet.

Mark is transported to the Old West and mistaken for an outlaw.