The Butterfly Kid is a character in Sparks Nevada, Marshal on Mars.
The Butterfly Kid is a robot outlaw and the leader of a robot outlaw gang. attempts to rob the space-coach that Sparks Nevada is escorting across Mars with Felton, Mr. Johnson and Wendy Johnson inside. He is spotted by Sparks Nevada while scoping out the space coach at an oasis, and then later, along with his gang, is successful in taking out several of Nevada's deputybots. The Butterfly Kid may or may not have been killed when a gang of bounty hunters overtook the gang while they were regrouping and heading after Nevada and the coach.
- The Sad, Sad Song of Widow Johnson, Part One (SNMOM #1)