Mark Haynes (born July 29, 1984), also known by his online persona Alvin-Earthworm, is a freelance digital artist and sprite animator. He is mostly known for being the creator of the Flash series Super Mario Bros. Z. He currently lives in Northampton, UK.
- Bolded projects are that year's most popular submission.
- C is for Cereal
- Super Mario Bros. Z Episode 1
- Super Mario Bros. Z Episode 2
- Super Mario Bros. Z Episode 3
- Super Mario Bros. Z Episode 4
- Beat Up Sandbag (Collaborative Effort, contributed to the Mecha Sonic segment and the Wario and Waluigi segment)
- Smash Kingdom Melee (Collaborative Effort, contributed to the Mario vs. Sonic segment)
- Super Mario Bros. Z Episode 7
- The name "Alvin" in Alvin-Earthworm's username comes from an old Earthworm Jim fan character that he created in his late teens. He has since retired the character.
- Contrary to popular belief, Alvin-Earthworm has been a furry artist longer than he has been a sprite animator.