Comics, The Mighty Thor Silver Age Group. Marvel. 1966 This group includes issues #120, 125, 127, 128 and 130. Story by Stan Lee, art by Jack Kirby (#120). Last issue of this title before the name change to 'Thor'. Hercules appearance. Cover and art by Jack Kirby (#125). First appearance of Pluto (#127). Hercules appearance (#128). Hercules and Pluto appearances (#130). [5]