From season 2 of The Secrets of Isis:
Isis (Joanna Cameron) gets help from Captain Marvel (John Davey) to clear Rick Mason (Brian Cutler) of robbery in the first half of a 2-part adventure. Here's "Now You See It" (which was also the name of a CBS game show around this same time):
Joanna Pang (Cindy) left the show after 1 season. Writer-director Arthur H. Nadel cut his teeth at Four Star, where he wrote and/or directed a number of episodes of The Rifleman and some of the studio's other Westerns. Filmation, I believe, marked a career revival for Nadel.
We'll have the conclusion tomorrow. Didn't see either half, so there's no rating. As it was, I was involved in other matters that precluded watching Isis back then.