the Planet of Thought

plot
The Neptunian leader Tyro has agreed to join the UGO.  After Colonel Raeburn has shown him around Space Headquarters, he prepares to return to Neptune.  Before he does so, however, he uses his hypnotic powers to “persuade” Marla to go with him.  Professor Haggerty invents a brain shield which prevents the Neptunians from hypnotizing or reading the thoughts of whoever wears it.  Raeburn sends Dart to Neptune to rescue Marla but, still under the influence of Tyro, she will not allow him to place the second shield around her head.  He returns to the Galasphere, where Husky is able to disguise the two main components of the shield as earrings.  Dart tells Tyro that he is convinced that Marla will never return to Earth but asks if he can give her the earrings as farewell gifts.  Tyro agrees and when Marla is freed from his hypnotic influence, he has no choice but to release her.

notes
The Neptunians make their third appearance in this episode. They had previously featured in the Cloud of Death and the Slaves of Neptune.
Before they joined the UGO, Mars knew nothing about science and Venus knew nothing about mechanics.

credits
a National Interest Picture production
produced by Roberta Leigh and Arthur Provis
directed by Frank Goulding
created & written by Roberta Leigh
voices by Libby Morris, Dick Vosburgh, Ronnie Stevens, Murray Cash
puppetry by Martin & Heather Granger, Joan Garrick
electronics by F.C. Judd
space consultant: Colin Ronan
RCA sound recording
script assistant: Denise Kaye
cameraman: Arthur Provis
editor: John Beaton
art director: Roland Whiteside
models: Derek Freeborn
special effects & animation: Bill Palmer, Brian Stevens, Bert Walker