The series follows Max, an adventurous preteen boy who receives a package in the mail. The package contains a red baseball cap emblazoned with a yellow "M".
Skullmaster, a megalomaniacal demon who lives within the earth and has the power to create evil minions to try and steal the cap which activates vortexs. Max is helped by Virgil, a nearly omniscient anthropomorphic "fowl" and Norman, his Viking bodyguard. They travel together around the world, defending Earth against the minions of Skullmaster.