Episode 4 of The Trigan Empire
Invaders from Gallas
aka The Invaders from Gallas (The Collection)
Bezoekers uit Gallas (Dutch title)
Visitors from Gallas (Dutch title, translated)
Written by Mike Butterworth
Illustrated by Don Lawrence
Invaders from Gallas was originally published in 9 installments in issues 38 (4 June 1966) to 40 (18 June 1966) of Ranger magazine & issues 232 (25 June 1966) to 237 (30 July 1966) of Look and Learn magazine.
An abridged version was reprinted in 7 installments in issues 970 (11 October 1980) to 976 (22 November 1980) of Look and Learn magazine.
It is reprinted in the Don Lawrence Collection Volume 1, The Invaders from Gallas.

Installments
38 39 40 232 233 234 235 236 237
Links
Plot summary (Dutch)
Downloads
MediaFire via British Comics Compilations