Episode 23 of The Trigan Empire
Trigo’s Five Tasks
aka The Five Labours of Trigo (The Collection)
De vijf opdrachten van Trigo (Dutch title)
Trigo’s Five Missions (Dutch title, translated)
Written by Mike Butterworth
Illustrated by Don Lawrence
It is reprinted in Volume 6 of The Trigan Empire—The Collection (the Don Lawrence Collection).
It is reprinted in Volume 2 of The Rise and Fall of the Trigan Empire (Rebellion).
Plot summary (Dutch)