Stingray

Ray is an enigmatic adventurer, a former CIA operative, with no traceable past who travels from place to place helping people in trouble, usually due to something illegal. He doesn't take money, but instead demands a favor from the person he helps, to be collected sometimes in the future. Often the favor is used to help someone else who needs Ray's services. Ray's real name isn't known, and it may or may not be an alias taken from the vintage Corvette Stingray that he drives.