Actor Stellan Skarsgård recently revealed that he will star in The Avengers, portraying the same character he plays in Thor.
While IMDB lists Stellan Skarsgård's character as "Professor Andrews," a recent interview indicates the character is named Doctor Selva, a scientist in New Mexico. There is no Professor Andrews or Doctor Selva in The Avengers comic books, so this character remains a mystery, for now.
Due to the ambiguity of the character's name, there is speculation that Stellan Skarsgård may play a secret villain in The Avengers.
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Joss Whedon is directing The Avengers from a script by Zak Penn. Production is scheduled to start in April.