The Hardy Boys/Nancy Drew Mysteries was unusual in that it
often dealt with the characters individually, in an almost anthological
style. That is, some episodes featured only the Hardy Boys and others
only Nancy Drew. (Wikipedia)
The Hardy Boys/Nancy Drew Mysteries (2X05: The Mystery of the Hollywood Phantom-Part 2) Frank Hardy wonders onto the set of Charlie’s Angels, and gets an accidental kiss from Jaclyn Smith, while Nancy Drew is defended by Robert Wagner on the set of Switch.