 The Andersons devised the formats and characters of all the Supermarionation series and wrote most of the pilot episodes.The presence of the "Zero-X" Martian Exploration Vehicle, first seen in the film "Thunderbirds Are Go" (1966), was intended to mark a transition between "Thunderbirds" and "Captain Scarlet", which are set in the same fictional universe.The pilot script, written in August 1966, differs significantly from the episode as filmed.