When a secret gunsight is stolen, Bill asks Ralph for help in solving the case. However, Ralph runs into problems when he keeps turning invisible unexpectedly, and must deal with the pressure of meeting Pam's parents.

Ralph uses his suit to help Rhonda, one of his students, after her mother is kidnapped by the Russians.

Ralph finds a window into the 4th dimension while scouting an old house. Bill gets possesed by a woman's spirit, and Ralph must return her through that window.

Bill has a treasure map, and takes Ralph and his class out to the desert to find the lost Diablo Gold Mine that vanished a long time ago, and are met with resistance from the local thieves.