Joanna Cameron, who was in "Negative Reaction" as Lorna McGrath but who is best remembered as the star of the Saturday morning series "The Secrets Of Isis" has sadly passed away at the much too young age of 70. https://nypost.com/2021/10/25/isis-actress-joanna-cameron-saturday-morning-star-dead-at-70/
I've never known Isis well enough, but she's so great as Lorna. I'm very sorry to hear it.