Episode 83 of The Trigan Empire
Terror of the Skorpiads
aka De terugkeer van de Skorpiads (Dutch title)
The Return of the Skorpiads (Dutch title, translated)
Written by Ken Roscoe
Illustrated by Gerry Wood
Terror of the Skorpiads was originally published in 14 instalments in issues 999 (2 May 1981) to 1012 (1 August 1981) of Look and Learn magazine.
To date it has not been reprinted in English.
Plot summary (Dutch)