Mark Acheson is a Canadian actor born in 1957, though his exact birthdate isn't documented. He's best known for his voice work with the Ocean Group Company, where he's lent his voice to some pretty memorable characters. Most notably, he voiced the massive villain Unicron across two Transformers series—Armada and Energon—making him the voice behind one of the franchise's biggest threats. He's also done voice work on the 2002 He-Man and the Masters of the Universe revival, playing characters like Fisto and Chadaz.

Beyond animation, Acheson appeared in a minor role in the 2009 film adaptation of Watchmen, rounding out a career that's primarily focused on voice acting.