Part 1 of 9. 1st appearance of the new Supreme Hydra, later revealed to have been its real leader all along, behind-the-scenes. Jack Kirby apparently based Jasper Sitwell on Roy Thomas. John Buscema's 1st 1960s Marvel work (even though Stan welcomed him back in the credits of TALES TO ASTONISH #85 the same month).
Part 2 of 9. Jim Steranko's 1st work for Marvel.