Photo cover. The shot of Thunderbird 3 being attacked by the Venusian monster is not taken from the TV series, but was shot especially for TV Century 21. It was also used for the cover of the Dutch comic TV 2000 (Nederlandse Rotogravure Pers, 1966 series) #13/1967.
Part 1 of 4.
Part 8 of 16.
Part 1 of 8.
As revealed in the fifth part of this story in #94, "Rudolf Cass" is, in reality, The Hood, usually seen in the Thunderbirds strip, but here aligning himself with Titan and X20 against the Stingray crew.