Mike Derks is an American guitarist, best known as the rhythm guitarist in the American heavy metal band Gwar since 1988. On stage he appears as a humanoid creature with a face resembling a bear-trap, usually portrayed wielding an enormous battleaxe.

This Toilet Earth is the fourth album released by heavy metal band Gwar. Released on March 29, 1994, this album was to be one of their oddest and most bittersweet albums. It was the first Gwar album to be censored, due to their gain in popularity as a result of MTV exposure. The music and artwork is almost cartoonish when compared to the previous albums, and the instrumentation had expanded to include horns that reinforce the goofiness. An instrumental version of the song "Jack the World" was also featured in the Beavis and Butt-Head video game for the Sega Genesis and Super Nintendo Entertainment System.