The character Baron von Strucker has been rumored to be joining in the action of Avengers: Age of Ultron. Today The Hollywood Reporter confirmed that Thomas Kretchmann (Valkyrie, Wanted, Resident Evil: Apocalypse) will be taking that role.
Baron von Strucker is a Hydra agent who, in the comics, was responsible for the “death” of Bucky Barnes as well as many other evil Nazi-ish nastiness. With the help of some Hydra technology, Strucker has been able to retard his aging process and can even be revived after having been killed.