City Magazines was the original and exclusive licence-holder for Dalek comic strips. While they held the Terry Nation-granted right to publish Dalek comics, their rival, Polystyle, were unable to use Daleks in the First Doctor comic stories. Likewise, because City didn't hold the rights from the BBC to publish Doctor Who comic strips, they were unable to use any characters or situations from the television series.
City used their licence to help launch their otherwise Gerry Anderson-themed magazine, TV Century 21. The entirety of the Dalek run would later gain the collective name, The Dalek Chronicles, by which the strips are generally known today.