|First appearance||Slow Burn|
|Debut||October 6, 2009|
|Home||Sullivan Bros. Carnival|
In chapter 2 of Slow Burn, Jack, Jennie, and Aiden play together. Aiden shows off his flying skills, which impresses Jack, although Jennie seems distracted. They ask Jennie what's wrong, and Jennie replies that her parents have been fighting, which upsets her. Jack comforts Jennie by saying that he agrees that it is frustrating when parents fight. Soon, the group splits up.
In chapter 4 of Slow Burn, Jack catches Chris spying on Aviv. He asks Chris if he wants to work out with his father. Chris fends off young Jack by telling him that Jennie has been looking for him. Delighted, Jack runs off to find Jennie.
In chapter 9 of Slow Burn, Bo and Chris watch Jack practice his ability with his father. After watching his father throw a log forward, Jack concentrates and the log telekinetically shoots forward at amazing speed until it could no longer be seen.
Jack has the ability to move objects with his mind. He is inexperienced but powerful with his ability, shown by his lifting a log into the air, but losing control and sending it shooting fast through the woods.
- For other uses of Jack, see Jack (disambig).