Episode 9 of The Trigan Empire
The Phials of Forgetfulness
aka Vannu’s Poison
The Lokan Invasion (The Collection)
Stad zonder geheugen (Dutch title)
City without Memory (Dutch title, translated)
Written by Mike Butterworth
Illustrated by Don Lawrence
The Phials of Forgetfulness was originally published in 6 instalments in issues 274 (15 April 1967) to 279 (20 May 1967) of Look and Learn magazine.
It was reprinted in 1975 in Vulcan comic.
It is reprinted in Volume 2 of The Trigan Empire—The Collection (the Don Lawrence Collection).
It is reprinted in Volume 1 of The Rise and Fall of the Trigan Empire (Rebellion).
Plot summary (Dutch)
MediaFire via British Comics Compilations