The "top-secret Sven-Cave" is a parody of the traditional Batcave of DC Comics hero Batman. The Sven-Cave features a Sven-mobile with the mustached skull of Zallman T. Tombstone mounted on the front (a retro vehicle styled after the Batmobile from the TV show
Batman (1966)), three encased displays of past and present Svengoolie/Son of Svengoolie costumes (like the Batcave's gallery of Batman/Robin uniforms), and a giant wooden nickel (in place of Batman's iconic giant penny).