John Denver was a country musician that lived on Earth during the 20th century. He was supposedly killed by the United States Air Force in 1997 on earth but managed to survive after the crash by eating hallucinagenic mushrooms an drinking his own saliva. He eventually left earth in 2001 on a Russian Manned trip to the moon where he assembled a rag tag group of bounty hunters to wreak havoc on the the peaceful worldof earth.
Colonel Sanders - The eldest and most experienced of the group. This man started a chain of fried chicken retaurants on earth in the 20th century and quickly earned the reputation of a bloodthirsty psychopath and left the planet in the 1980s to persue a career as a ambassador for the chicken industry on Mars, but a incident involving a deep fryer left him scarred and in a wheelchair.