Episode 76 of The Trigan Empire
The Flowers of Forgetfulness
aka De vruchten der vergetelheid (Dutch title)
The fruits of forgetfulness (Dutch title, translated)
Written by Ken Roscoe
Illustrated by Gerry Wood
The Flowers of Forgetfulness was originally published in 14 instalments in issues 884 (23 December 1978) to 897 (24 March 1979) of Look and Learn magazine.
To date it has not been reprinted in English.
Plot summary (Dutch)
MediaFire via British Comics Compilations