Jerry the Platypus was the first doppleganger that Heinz Doofenshmirtz made to destroy Perry the Platypus. Doofenshmirtz claims that he was so cute that he couldn't bear to destroy him. Jerry likes whacking things with his metal rod, including himself and Doofenshmirtz. Jerry is the only doppleganger to not fight when Perry arrives. When the fight begins, he and Doofenshmirtz just sit back and watch.
Jerry was created in the Platyproliferatorinator by Doofenshmirtz. He was destroyed when Perry the Platypus launched Jerry out of his lounge chair and on to the Platyproliferatorinator, hitting the reverse button and sucking in all of the dopplegangers that Doofenshmirtz made.