Journey Into Mystery #503 Nov 1996 & #521 June 1998
History: June 1952-Feb 1966 #1-125, retitled Thor for #126-502, Nov 1996-June 1998 #503-521
Summary: Journey Into Mystery started in 1952 and was a monster/sci-fi anthology
series until #83 when Thor, god of Thunder was introduced by Stan Lee and Jack Kirby.
Thor was promently featured in every issue and #125 was the last to feature the Journey Into
Mystery title as it was renamed Thor with #126. Thor lasted until #502 when the Onslaught
storyline in 1996, led to a relaunch of the Avengers and Fantastic Four characters
into all new #1 series that took place in a pocket universe. Thor was the only one to not
get a new book, but it was replaced with a new Journey Into Mystery title with #503. This new
series started Red Norvell and the Lost Gods who were displaced after Asgard disappeared.
With #514 the title started to feature other Marvel stars. When the Avengers and Fantastic
Four returned from the pocket universe, they also returned with new #1 issues in late 1997.
Thor returned with a new #1 issue also in July 1998 and this meant the end for Journey Into
Mystery with #521. Journey Into Mystery is the longest running Marvel title if you count the
thirty years it spent titled Thor.