Making sense of this Spider-Man world.
Peter Parker, the Spectacular Spider-Man #032 (1979)
“A Zoo Story”
Writer: Bill Mantlo
Artist: Jim Mooney
Peter gets a job assistant teaching with Dr. Connors. Connors has somehow inadvertently made an Iguana able to grow human size like The Lizard. At the zoo where the class is held, Peter changes into Spider-Man and fights the Iguana.