Mark Acheson is a Canadian actor with a lengthy career in film, television, and voice acting, particularly recognized for his work in animation and English dubs of anime series. Born on September 19, 1957, he began his acting training at the age of 15 at Langara College's Studio 58 in Vancouver. He was a founding member of the Janus Theatre and spent eight years performing on stage before transitioning to screen work in his thirties. His live-action film credits include supporting roles in notable productions such as Elf, The 13th Warrior, Watchmen, and the television series Supernatural and Fargo.

In the realm of voice acting, Acheson has built a substantial body of work, frequently being cast in roles that portray villains or antagonists. He is well-known within the Transformers franchise for his contributions to the English dubs of the early 2000s anime series. He provided the voice for the planet-consuming entity Unicron in Transformers: Armada (2002-2003) and its sequel Transformers: Energon (2004), where he also served as the narrator. He later voiced the character Crumplezone, a large and powerful Decepticon from the planet Velocitron, in Transformers: Cybertron (2005-2006).

Beyond the Transformers series, his anime dubbing credits include roles in.hack//Roots as Tawalaya and Touta, and in Black Lagoon as Boris. He also voiced the character Lux in an arc of the animated series The Little Prince. His voice acting portfolio extends to western animation as well, where he played the villainous centaur Lord Tirek in My Little Pony: Friendship Is Magic, Sabretooth in the animated film Hulk Vs., and characters like Fisto in He-Man and the Masters of the Universe. Acheson's career demonstrates a consistent presence in both live-action and voice performance, with a particular emphasis on bringing antagonistic characters to life across various genres and media.