Grottu's next appears in Fantastic Four Unlimited (Marvel, 1993 series) #7 (September 1994), his next chronological appearance is in Marvel Monsters: Monsters on the Prowl (Marvel, 2005 series) #1 (December 2005). In later retcons it is established that Grottu's creation was planned by the Deviants.
Job number from Dr. Michael J. Vassallo via the Atlas/Timely discussion group.
Story is pages 3-8 of comic (pages of story numbered 1 to 6).
Job number from Dr. Michael J. Vassallo via the Atlas/Timely discussion group. Story is pages 10-14 of comic (pages of story numbered 1 to 5).
Text story with illustration. Text story is pages 16, 24 of comic (pages of story not numbered).
Job number from Dr. Michael J. Vassallo via the Atlas/Timely discussion group. Story is pages 17-18, 20-23 of comic (pages of story numbered 1 to 6).
Job number from Dr. Michael J. Vassallo via the Atlas/Timely discussion group. Story is pages 26, 28-32 of comic (pages of story numbered 1 to 6).