What actors and actresses appeared in American Herro - 2009?

There is no movie or TV show called "American Herro". Perhaps you meant "American Hero" or "American Hero: The Adventures of Captain Awesome", which was a TV show.

American Hero: The Adventures of Captain Awesome (2009) starred:

* Seth Rogan as Captain Awesome

* Michael Cera as The Boy

* Alison Brie as Nurse

* Samm Levine as The Captain's Sidekick

* John C. Reilly as The Captain's Dad

* Judy Greer as The Captain's Mom

* David Koechner as The Captain's Rival

* Natalie Portman as The Captain's Girlfriend

If you had a different title in mind, please provide it and I can help you find the cast information.