Jack Menhem is Pasclae Menhem's husband and the father of Miguel. He is the son of Farid and Leila.
Jack from the Alien/Ultimate Evolution timeline first appears in Groundation, where he and Pascale discover Miguel's superhero activities. Apparently unable to handle the thought of their son constantly risking his life, and angered about Ben's constant lying about his activities, they ground him, forbid him from using the Omnimatrix, and tell Gaelle's parents of her superheroism, resulting in her grounding as well and Jeff being forced to fight the Lowbreed alone. Jack with Pascale Additionally, Miguel was furious when he found out his father had something to do with it. When this proves to be too much for Jeff to handle, Miguel openly defies his parents and uses the Omnimatrix to turn into King and, (literally) blasts a hole in the wall, left the house and help Jeff; through this, they realize how important the things Miguel is doing really is. They come to help Miguel and Jeff fight, and admitted that they are proud of Miguel, allowing him to resume his super heroism. During this time, Jack admits that he had known all along about Farid's time in the Alien Decomposers and resented him for it, but now realizes that he was protecting them just as Miguel was.
He was once ambushed by Caster, Coco and Vulkanus. One of the trio flattened his car tire, making him unable to escape. They were about to strike when Miguel, Gaelle, Jeff came along and saved him. He was completely oblivious to what was happening.