Sylvia Anderson (in-universe)

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When discussing whether Cloudbase was a reference to Thunderbirds or Captain Scarlet, the Twelfth Doctor claimed that he had once met Sylvia Anderson, and that "you['d] never seen a foxtrot like it". (TV: Death in Heaven)

Behind the scenes

• Though the link isn't directly made in Death in Heaven, in the real world, Sylvia Anderson co-created both Thunderbirds and Captain Scarlet.