Original sentence: Davies commented that the Sontarans were "always on his list" of villains to resurrect.This episode continues the pattern of having monsters from the classic series return in the new one
Edited sentence: The Sontarans were the fourth major villain from the classic series to return, after the Daleks, Cybermen, and the Master; Davies commented that the Sontarans were "always on his list" of villains to resurrect