Episode 17 of The Trigan Empire
The Volcano Factory
aka The Terror of Mount Spyx
Het purperen licht (Dutch title)
The Purple Light (Dutch title, translated)
Written by Mike Butterworth
Illustrated by Ron Embleton
The Volcano Factory was originally published in 8 instalments in issues 383 (17 May 1969) to 390 (5 July 1969) of Look and Learn magazine.
It was reprinted in 1976 in 2 issues (24 January 1976 & 31 January 1976) of Vulcan comic.
It was reprinted in 8 instalments in issues 924 (6 October 1979) to 931 (24 November 1979) of Look and Learn magazine.
It is reprinted in Volume 2 of The Rise and Fall of the Trigan Empire (Rebellion).
Plot summary (Dutch)
MediaFire via British Comics Compilations