Reanimation

Reanimation is a type of Chromosome technique that brings someone back to life with an infinite amount of Chromosomes and regeneration.

Before Part 2
Freddie Freaker stole the secret to this technique and learned how to do it.

Part 2
Freddie Freaker intentionally leaves one of his reanimation vats at Lone Star Base to get the United States to learn about it after resurrecting the ex-principal of Judkins Middle School to prove the supremacy of reanimations over Pivot Stick Figures.

Part 4
Willem Dafoe uses Egyptian Ghost Goop sent by Yahtzee to perfect the technique for bringing back The Heavy TF2, though Joey seals away the reanimation before anything else can be done with him.