Peter Parker, the Spectacular Spider-Man #034 (1979)
“Lizards on a Hot Tin Roof!”
Writer: Bill Mantlo
Artist: Jim Mooney
The Lizard and Iguana fall off the roof and end up in the sewer. Unable to follow, Spider-Man goes to Connors’ lab and makes a portable version of the device Connors was working on. Then he catches up with the reptiles and uses the device to transfer The Lizard’s life force to The Iguana. Iguana can’t handle it and explodes. Spider-Man says Connors shouldn’t turn into The Lizard anymore.