to let the audience know that the show is going to be fun and not just an action show. The opening credits were altered in the third season and beyond to reflect that Ghostfreak was no longer to be used, and was replaced by Cannonbolt as the ninth alien. Casting Kris Zimmerman was in charge of casting and was the voice director. Tara Strong voices the title character Ben Tennyson, Upgrade, Benwolf, Lucy Mann-Tennyson, Ken Tennyson, and Sandra Tennyson. She also voices Future Gwen and Buzzshock in "Ben 10,000". Meagan Smith voices Ben's cousin Gwen Tennyson, and Paul Eiding voices Grandpa Max and his version of Upgrade. Steven Blum voices Ben's alien transformations Heatblast and Ghostfreak, as well as the series' main villain Vilgax. Dee Bradley Baker voices Ben's transformations Stinkfly, Eye Guy, and Wildmutt, Baker also voices Ben's school bully/friend Cash Murray, and many of his enemies such as The Limax, SixSix, Acid Breath, and the character Elsgood. Baker is also notable for voicing various characters and aliens. Richard Steven Horvitz voices Ben's Grey Matter transformation and the villain Sublimino. Richard McGonagle voices Ben's Four Arms transformation, and the villain Exo-Skull. Fred Tatasciore voices Ben's aliens Ripjaws, Cannonbolt, and Way Big, Tatasciore also voices a future version of Ben in "Ben 10,000". And Jim Ward voices the transformations Diamondhead, XLR8, and Wildvine, and the character Gordon Tennyson. Films, sequels, and spin-offs TV films Two Ben 10 films have been released at different times during 2007 and 2008. The first is a regular animated feature called Secret of the Omnitrix, in which the Omnitrix is accidentally set to self-destruct and Ben must track down its creator to stop it. A trailer of the film was released with the film Billy & Mandy: Wrath of the Spider Queen, and it aired August 10, 2007. Michael Ouweleen described the film's villain, which was actually Vilgax, as "like Darth Vader without the sense of humor." A different version of Secrets of the Omnitrix, which introduced a different alien (Eye Guy) to the one in the original (Heatblast), aired on September 1, 2007. A third version (in which XLR8 was featured) aired on October 20, 2007. It was stated during the premiere of Alien Force that Secret of the Omnitrix was intended to be the chronological finale of Ben 10, even though it was broadcast long before the last episode, which was not canon.