After learning of Scott's crash in Thunderbird, John states "I guess he doesn't have to do his spell of satellite relief until he's fit". Up until this episode, the only two Tracy brothers to be on duty in Thunderbird 5 were John and Alan.
The original title for this episode was Desert of Danger.
First appearance of Thunderbird 3.
In the episode "The Uninvited", the Zombites' jet fighters are adapted and re-sprayed WASP aircraft from Stingray (1964).
During the campfire cookout, an on trend (for the time) Corning Ware casserole is shown while Tin Tin is talking with the group. This is an interesting element, as if it was for regular use (not a toy or a model), then the puppets themselves were near human in proportion.