A famed surgeon, Dr. Corso, is forced to mechanically enhance a gang of teenagers when they kidnap his wife and force him to do their bidding. They have Terry outmatched until he tracks down Corso. Corso has put in a voice-activated failsafe but doesn't want to reveal it and endanger his wife ... until he sees his wife April cavorting with the gang leader. Terry gets the keyword ("April Moon") and deactivates the cybernetic gizmos. The gang leader, Bullwhip, escapes but comes back to Corso for help unaware the doctor knows about him and April.