This issue is a variant of The Defenders (Marvel, 1972 series) #68 [Regular Edition].
Variants of this type were distributed under limited deals between publishers and distribution "jobbers" (Whitman was one, but not the only one) who could get comics into outlets that did not consistently carry comics. The retail unit was a bag containing more than one comic.
Cover colorist credit provided 2007 by Al Milgrom.
Val in Valhalla Part 3; Val in old costume again
Letters from readers: Terence Folger, Bill Telin, Phil Latter