Jack is one of the sons of the two Saiyans Nick and Zoe and the older brother of Jesse. He has an on and off relationship with Chrissy. Jack is a smart and a sensitive person in the series and is very powerful. Jack and Jesse use the Fusion Technique to create Jesk who is a main fusion. Jack will do anything to protect the ones he loves. He thinks Jane is nuts because she tried to tie him up and put him in dress. He is a pure blooded Saiyan.