Steve Blum voices Ulysses Klaue in Marvel's Avengers. He is better known for voicing Spike Spiegel in Cowboy Bebop, Ares in the God of War series and Sub-Zero in the Mortal Kombat series.
Blum is well-known for voicing Wolverine in various Marvel projects, including Wolverine and the X-Men, X-Men Legends game series, Marvel Anime, and LEGO Marvel Super-Heroes. He has also voiced Norman Osborn in Spectacular Spider-Man, Red Skull and Beta Ray Bill in The Avengers: Earth's Mightiest Heroes and Kang the Conqueror in Avengers Assemble.