Mark Ruffalo is an award-winning actor, director, producer, and social activist. Known for high-profile roles in movies such as The Kids Are All Right, The Normal Heart, Foxcatcher, and Spotlight, as well as blockbusters like The Avengers and The Avengers: Age of Ultron, he made his directorial debut with Sympathy for Delicious at the Sundance Film Festival in 2010.

Tom Hiddleston rocketed to fame when he took on the role of Loki in Marvel Studios' 2011 feature film Thor, a role which he has since reprised in blockbuster films The Avengers and Thor: The Dark World. He graduated from the Royal Academy of Dramatic Art in 2005 and won the Laurence Olivier Award for Best Newcomer in a Play in 2008.

Scarlett Johansson is an actress best known for her work in films like Lost in Translation, The Nanny Diaries, Vicky Cristina Barcelona, The Avengers, and Hitchcock. She began acting as a child, and her role in the movie The Horse Whisperer brought her critical acclaim at the age of thirteen. Also a singer, Johansson released her first album in 2008 with musician Pete Yorn.