Peter appeared in the episode "The Tale of the Reanimator". He was portrayed by Michael Yarmush.
Peter is the elder brother of Julie, and a friend of Jake. He is a bit mean-spirited and a jerk to his sister at times, but he still loves her. D
uring the events of the episode it was April Fools' day. So he thought his sister was going out of her way to play a joke on him and his friend.
He didn't believe her, when she tried to tell him that Mr. Doyle ( the scientist she worked for after school) had invented a revitalizing fertilizer serum. One which could regenerate DNA and bring organisms back to life. So later that evening, he planned to get back at his sister. He and Jake dressed up like shrub monsters and scared her, on her way out.
On the way home, Julie once again tried to convince him that Mr. Doyle had invented the serum. And that the professor must be planning to revive his late wife. He and Jake reluctantly followed her to the cemetery where they could see Mr. Doyle visiting his wive's gave. He still didn't believe her. He just thought that she got Mr. Doyle to play along with her.
She showed him a vial of the serum to prove it to him. Then thinking it was all a big joke, he took the vial from her and went over to a random grave. He picked the grave of Ian Kazex (whose epitaph said "May he be forgiven") He was convinced this was the right grave to pour it onto since the corpse sounded like a really bad person. So he dumped the serum all over the soil.
It didn't seem to work at first, but after they left, he mistakenly reanimated a murderer! It followed them home. The zombie was out to get them. So Julie screamed for him to help her when she answered the door. But he didn't believe her. He just thought that the pizza guy was at the door. So he left the front door opened and kept calling for the pizza guy.
When he finally turned around, he along with his sister and Jake could see it was the zombie so they all ran over to Mr. Doyle's place for help. On the way Julie instructed him to spay it with cold water. Since she remembered that Mr. Doyle used water to wash off the serum, on a previous demonstration. But for some reason it didn't work.
Then inside the laboratory Jake found the hot box room and pointed out how the heat was shriveling up and killing the plants. So they realized that needed heat to remove the serum. So he entered the hot box room and taunted the zombie to come after him by waving the serum vial at it. Then his sister and Jake closed the door, and instantly the heat in the room immediately caused the evil zombie to dry and wither away choking back to death. It was a very unpleasant sight. Afterwards it made him sick!
- Michael Yarmush also portrayed Jonah.