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Official Site: BBC

The Silurians are a race of reptilian humanoid in the long-running British science fiction television series Doctor Who. The species first appeared in Doctor Who in the 1970 serial Doctor Who and the Silurians, and were created by Malcolm Hulke. The first Silurians introduced are depicted as prehistoric and scientifically advanced sentient humanoids who predate the dawn of man; in their backstory, the Silurians went into self-induced hibernation to survive what they predicted to be a large atmospheric upheaval caused by the Earth capturing the Moon.

The Silurians introduced in the 1970 story are broad, three-eyed land-dwellers. The 1972 serial The Sea Devils, also by Hulke, introduced their eponymous amphibious cousins. Both Silurians and Sea Devils made an appearance in 1984's Warriors of the Deep, and did not appear in the show again before its cancellation in 1989. Following the show's revival in 2005, heavily redesigned Silurans were reintroduced to the series in 2010, and have recurred frequently since then, while the Sea Devils first reappeared in 2022, with their designs mostly unchanged. In 2018 the real-life scientists Adam Frank and Gavin Schmidt named their Silurian hypothesis for the fictional species.

Commonly called Silurians, after their supposed origins in the Silurian period, the creatures have also been referred to by other names. In The Sea Devils, the Third Doctor (Jon Pertwee) claims that "properly speaking", the Silurians should have been called "Eocene". and is first used in the series proper in the episode "The Hungry Earth" (2010). In The Sea Devils, an amphibious Silurian is dubbed a "Sea Devil" by the human workman Clark (Declan Mulholland), while in Warriors of the Deep, the land-dwelling Silurians use the term "Sea Devil" to refer to their aquatic counterparts.

Drawing on the ideas of the Quatermass serials, producer Peter Bryant and producer and script editor Derrick Sherwin decided that for the series' seventh season, the show's protagonist the Doctor should be restricted to contemporary Earth and work alongside the UNIT organisation, featured prominently in the sixth season's serial The Invasion. Producer Barry Letts and script editor Terrance Dicks, inheriting this new vision for the series, also wanted their stories for the seventh season to have a serious, deeper subtext. They approached Malcolm Hulke, co-writer of the Patrick Troughton serials The Faceless Ones (1967) and The War Games (1969), to write a serial for this new season.

The Sea Devils has not been a contender in any CBUB matches.