Episode 63 of The Trigan Empire
The Frozen People
aka De klauwen van het verleden (Dutch title)
The Claws of the Past (Dutch title, translated)
The Frozen People was originally published in 10 installments in issues 782 (8 January 1977) to 791 (12 March 1977) of Look and Learn magazine.
To date it has not been reprinted in English.
Plot summary (Dutch)
Installments
782 783 784 785 786 787 788 789 790 791