In September 2000, Blum voiced TOM, the robotic host of Cartoon Network's Toonami programming block. Blum replaced Sonny Strait in the character's second through fourth incarnations, until the cancellation of Toonami on September 20, 2008. When Toonami was revived on May 26, 2012, Blum returned as the voice of TOM. He is also the announcer for 7-Eleven's "Oh Thank Heaven" television and radio advertisements, and partnered with Vic Mignogna in the series Real Fans of Genius (a parody of Anheuser-Busch's Real Men of Genius radio ad campaign).
His credits include the voice of Spike Spiegel in the anime show Cowboy Bebop; Zeb Orrelios in Star Wars Rebels; Mugen in Samurai Champloo; Roger Smith from The Big O; Orochimaru, Zabuza, Ōnoki and Ao in the Naruto anime; and Wolverine in numerous games and in the animated series Wolverine and the X-Men, the animated movie Hulk Vs, The Super Hero Squad Show and Marvel Anime: X-Men. He also provided the voice of Jack Cayman, the main character of the video game MadWorld; Captain Foley, the venerable company commander, and Tank Dempsey, the comic relief in the Call of Duty series; Professor Galvez in Metal Gear Solid: Peace Walker; Grayson Hunt, the main protagonist of Bulletstorm; and Gorim, Oghren, and First Enchanter Irving in the 2009 video game Dragon Age: Origins. He also provides the voice of Vincent Valentine in the Final Fantasy VII compilation.
On June 5, 2012, he was awarded a Guinness World Record for being the most prolific video game voice actor, having 261 credited appearances on May 10.
