Julie Yamamoto is introduced in Ben 10: Alien Force as Ben's new love interest. She first appears in the first episode, where Julie congratulates Ben on his soccer win, sparking Ben's feelings. Julie later plays a bigger role in "Pier Pressure", where Ben manages to ask her out on a date (with help from Gwen). Their romantic evening at the pier soon turns wild when a Galvanic Mechomorph attacks the area. Although Ben is initially desperate to hide his heroic lifestyle from Julie, he is eventually forced to come clean about it. Surprisingly to Ben, Julie has no problems with Ben's Omnitrix-fueled exploits, and later helps him to repair a damaged Mechomorph ship. Julie Yamamoto is Ben Tennyson's current girlfriend in Ben 10: Alien Force. Julie Yamamoto will return in Ben 10: Alien Force Season 2.

Julie Yamamoto's First Appearance
Ben 10 Returns Part 1

Julie Yamamoto's Last Appearance
Ongoing