Thomas Kretschmann Cast as Baron Strucker in Avengers: Age of Ultron

Strucker first appeared in 1964's "Sgt. Fury and his Howling Commandos." A former Nazi officer, Strucker's body is host to the "Death Spore Virus," which gives him powerful healing abilities and has stopped his aging. If he dies, however, the virus can go airborne and wipe out all life on Earth.

Written and directed by Joss Whedon, the film is set to also star Robert Downey Jr., Elizabeth Olsen, and Aaron Taylor-Johnson (with many more names expected to be confirmed soon). Avengers: Age of Ultron hits theaters on May 1, 2015.