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Foes

When Sydney Newman commissioned the series, he specifically did not want to perpetuate the cliché of the " bug-eyed monster " of science fiction. However, monsters were popular with audiences and so became a staple of Doctor Who almost from the beginning. Daleks, Cybermen, and the Master are some of the most iconic foes the Doctor has battled in the series.

With the show's 2005 revival, executive producer Russell T Davies stated his intention to reintroduce the classic monsters of Doctor Who. The Autons with the Nestene Consciousness, first seen in 1970's Spearhead from Space, and Daleks, first seen in 1963's The Daleks, returned in series 1. Davies's successor, Steven Moffat, continued the trend by reviving the Silurians, also first seen in 1970, in series 5 and Zygons, first seen in 1975, in the 50th-anniversary special. Since its 2005 return, the series has also introduced new recurring aliens: Slitheen (Raxacoricofallapatorians), Ood, Judoon, Weeping Angels and the Silence.