Captain Z-Ro was a scientist who worked in a remote secret laboratory to safeguard mankind and history from potential conflicts. He had a time machine, the ZX-99, both to view history and to send someone back in time. He also had a rocket capable of traveling 84,000 miles per hour. He was supported by a team, but relied mainly on his young assisstant, Jet, who was frequently sent through time and space to put things right. Jet had an unfortunate tendency to daydream.