John Roberts is the founder of Greenteeth and director of its productions. He has played in various productions outside of Greenteeth such as Gardener's World Spoof, What John likes to do (when he's not being filmed), All the Gear and Doctor Why.
In Greenteeth he plays the following roles:
- Greasgorrok (a.k.a Greasy Gamer)
- Sgt. Rambantango
- Voice of SuperSatan 1000
- Voice of SuperSatan 3000
Roberts is currently working on short movies related to the Greenteeth Multiverse and short novels.