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 e Robin (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).
