Landing on an island off the coast of Florida via hot air balloon, the Pussy Cats meet Dr. Strangemoon and learn of his plan of launching satellite rockets into orbit and using them to magnetically draw comets toward the Earth, crashing all over the planet. He then sends Alexander, Alexandra, and Melody up on one his rockets to carry out his diabolical plot. Can the others save them in time?
- Like the previous episode, it derives some elements from Jules Verne's Mysterious Island.
- When talking to Dr. Strangemoon about the Pussy Cats' unintentional landing, the Head Guard is voiced by Casey Kasem. However, he is voiced by John Stephenson afterward.
- It seems far-fetched for Dr. Strangemoon to launch warheads toward Earth while also blowing up his own base in the process.
- Sherry Alberoni as Alexandra Cabot
- Barbara Pariot as Valerie Brown
- Jerry Dexter as Alan Mayberry
- Jackie Joseph as Melody Valentine
- Casey Kasem as Alexander Cabot III, Strangemoon Guard, Head Guard (when talking to Strangemoon; see Goofs)
- Don Messick as Sebastian
- Janet Waldo as Josie McCoy
- Barney Phillips as Dr. Strangemoon
- John Stephenson as Head Guard (rest of the episode), Robot