A mysterious plague is killing off all plant life, and the Indians in the area are becoming restless. Jim and Artie are sent to investigate, and find themselves up against a knight and his band of ""merry men"". The knight is a powered suit used by their nemesis Dr. Loveless, who created the plague and is using it and shipped food supplies to force the Indians to do his bidding. They're not too happy with the whole situation, and think Loveless is the representative of the ""Lord of the Forest"". After a capture-and-escape or two, Jim challenges the knight to a duel. Loveless tries to rig the fight with an exploding mace, which West avoids. Loveless prepares to send his plague on balloons across the country. The Indians turn against Loveless, and he and Antoinette are seemingly destroyed by a fire. They hide in a secret compartment, for Loveless to return to fight another day.
Elenco: Robert Conrad , Ross Martin , Charles Aidman , Agnes Moorehead .