In an alternate timeline, Garrett Tarses was a human male in the 23rd century native to Mars. His grandfather had been a member of the Human Loyalists, who opposed the Declarationists who wanted to make Mars independent of United Earth. This character may have been intended to be an ancestor of Simon Tarses, given his Martian heritage, and the similarity of his name to the actor who portrayed Simon, Spencer Garrett. Even so, no "real world" counterpart for this character has been established.