The Replacements

While the Rangers are trying to find out who is behind a mining ship's hijacking, the Rangers are given the assignment of taking care of an android troubleshooter called "ringer". They soon feel that the ship is being used by Isogul, a Hobbaba crime lord who has smuggled "Exjay", a powerful drug. However, before they can prove, they have to return it. They find out the plans of Colonel Weiss to replace all the Space Rangers with androids.