When Zandor hears a bird shriek he departs without warning and Dorno leads the Herculoids after him. A mole ship is invading the surface and attacks Dorno. Zandor goes after the Mole Men guards guarding the surface entrance in preparation of invasion. Knocking them out, he descends into the depths of the Earth and confronts Markon. Targo, an imprisoned rebel, helps Zandor to escape while Markon pursues. Zandor makes his escape and the Herculoids toss the sentry ship back down the tunnel.
Elenco: Don Messick , Virginia Gregg , Mike Road , Sparky Marcus , Ted Cassidy , Ted Eccles .