You know you’re nerd-approved when you’re asked to voice a video game character.

EA/BioWare have announced the line-up of celebrity voices who you’ll be listening to for hours on end while playing “Mass Effect 2.” They are as follows…

Martin Sheen as the mysterious Illusive Man who commands Cerberus, a secretive paramilitary organization dedicated to protecting human interests in the galaxy.

“Chuck” star Yvonne Strahovski as deadly Cerberus operative Miranda Lawson, who has been genetically engineered for superior mental and physical traits.

There’s also: “Battlestar Galactica’s” Tricia Helfer as EDI, the voice of the new Normandy; “The Matrix’s” Carrie-Anne Moss as Aria T’Loak, the crime lord who rules the planet Omega; “24/FlashForward’s” Shohreh Aghdashloo as Admiral Shala’Raan vas Tonbay; “Battlestar’s” Michael Hogan as Captain Bailey; “Firefly/Chuck’s” Adam Baldwin as Kal ‘Reegar; and “Star Trek’s” Michael Dorn as Gatatog Uvenk.

Back for round two (hurray!) are Seth Green as Joker and Keith David as Admiral David Anderson.

FYI: the image above is of the Terminus Assault Armor and the M-490 Blackstorm Heavy Weapon, which you’ll get only if you pre-order the game. It’s out on Xbox 360 and PC on Jan. 26.