Behind the scenes
The term "Super Daleks" appears on the game box cover of Dalek Attack. It is not made clear which of the many Dalek variants featured in the game possessed this designation.
The term, at any rate, far predates the video game: the Super Daleks appeared in Inside a Skaro Saucer, one of the non-narrative features in The Dalek World, where it was stated that any Dalek flying saucer contained a Super Dalek at all times. An illustration of a Super Dalek was provided. It was stated that the Super Daleks had hypnotic powers and the ability to effect thought transference.