Guest Stars Charlie Adler voices Dr. Doom Tom Kenny voices Captain America Alimi Ballard voices Thunderball Charlie Adler voices Sabretooth A.J. Buckley voices Toad Kevin Sorbo voices Ka-Zar A.J. Buckley voices Batroc Travis Willingham voices Newscaster Steve Blum voices Pteranodon Steve Blum voices Zabu Dave Boat voices Zookeeper Mikey Kelley voices Young Scientist Julia Morrison voices Woman Julia Morrison voices Zookeeper