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An idea was a simple, immaterial concept.
History[]
In 43K2.1, the Tenth Doctor once pointed out that "an idea [was] hard to kill", when realising that the Beast had escaped its prison despite its physical form being trapped by turning itself into the "idea" of the Devil. (TV: The Satan Pit [+]Matt Jones, Doctor Who series 2 (BBC One, 2006).)
Undated events[]
Alydon claimed that, prior to the Neutronic war, Skaro was "full of ideas". (TV: The Daleks [+]Terry Nation, Doctor Who season 1 (BBC tv, 1963-1964).)
Early on in his life, the Fifteenth Doctor reflected on how the "pantheon of enemies" he'd face had "no idea what they'd let themselves in for." (PROSE: "Heroes of Time" [+]Part of Whotopia: The Ultimate Guide to the Whoniverse, Simon Guerrier, Una McCormack and Jonathan Morris, BBC Books (2023).)