Marvel Two-in-One, Vol. 1 Annual #1 (1976)

Their Name Is Legion
With the FF returning from the past with only half of the missing vibranium, the Thing discovers that the Nazis may still be able to use the missing metal to win World War II; The Thing takes a solo time trip back to 1942 where he meets up with the Liberty Legion and they tackle Skyshark, Master Man and U-Man as Ben tries to find the stolen vibranuim.
Release Date: 1976