First seen in Ben 10'000, he is depicted as a distant loner with a serious agenda to perform his heroic duty, so much that he has lost almost all touch with his family in lieu of protecting his sector 24/7. To this extent, he remains in the form of XLR8 to get from place to place in a flash. The years have apparently been rough to Ben, even so much as having had to severely mutilate Vilgax to ensure his death, which puts his younger self at unease. Not exactly appreciative of the character he would turn out in the future, Ben reminds his future self that his alien forms were not the only weapons he had at disposal. When Dr. Amimo reanimates Vilgax, the two Bens are presented with no other choice than to combine their powers to defeat the newly-empowered villain. After a reminder from his younger self, Ben 10,000 has a change of heart and resumes his human (now adult) form and toys with Vilgax. With Ben 10's assistance once more, the two are able to encase him in a block of ice after the alien falls into a pool where Ben 10,000 reveals an ice-bound alien which is given the name Arctiguana.
In Ken 10, it is revealed that Ben has a son named Ken Tennyson (the mother being Kai Green). For his tenth birthday, he hands him the old Omnitrix. Unfortunately, it operates just like the old one, which randomizes his choices for him and has a time limit. Attempting to teach him, the lessons rather fail when Ben ends up doing all of the work, depriving his son of any experience. Ben is reminded of a future Gwen that he has to learn to let go and allow his son to fight with him. He then agrees to allow his son to fight alongside him, but quickly changes his mind when Kevin makes a sudden reappearance, locking his son in his room.