Thor Annual Vol.1 #6

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The Korvac Saga: Prologue - The Guardians of the Galaxy guest star in "Thunder in the 31st Century!"

Printed: Oct 1977
Writers: Roger Stern
Art: Sal Buscema and Klaus Janson
Cover: John Buscema and Joe Sinnott

Key Issue Details
- 1st appearance of the Achernonians
- 1st appearance of Brahl
- 2nd appearance and origin of Korvac