Ben 10 Fan Fiction Wiki
Ben 10 Fan Fiction Wiki
Spoilers Ahead!
This page contains hefty spoilers regarding Julie Yamamoto in Back in Action: Alien Universe.

Julie Yamamoto was the Galvanic Mechamorph-merged Human girlfriend of Ben Tennyson, who featured heavily in Back in Action: Alien Universe.


This section is incomplete.


Julie was a go-getter, determined to get what she wanted, whether it was vying for her boyfriend to play her at tennis or acing every class in school. She's in tune with her emotions, inviting conversation in all friendly and other relationships. Highly competitive, however, she could become easily enraged from losing one of her professional tennis games.

Powers and Equipment[]

Originally, she got assists from Ship in the form of an over-sized mecha suit, but after events in No Strings Attached, she became merged with a Galvanic Mechamorph offspring made from Upgrade. This allowed her to conjure weapons and defenses at will.

Back in Action: Alien Universe[]

This section is incomplete.

Julie Yamamoto also exists in canon. Unless otherwise stated, all related events, roughly up until the Omniverse Season 3 finale, happened unchanged.

  • She first appeared in Infernosphere, where she aided Ben on her journey to Azmuth.
  • A possible future was shown where Earth is destroyed by the Thep Khufan Commander after Ben perishes in a fight with Scarogus including her in Limited.
  • In Magikfest, she appeared at the end of the episode without Ship (revealed to be because she thought the ship would be fight-free during No Strings Attached) to meet up with Ben and Gwen as he asked. She was driven there by Kevin.
  • In No Strings Attached, she became a main character. She is accidentally fused with Upgrade's offspring, Ken, by Sii.
  • In The Sea's the Limit, she adjusted to her new powers as a fighting member on the team.
  • In Hit and Miss, she appeared in the beginning of the episode being dropped off by Ben at her house.
  • In New Girl, she agrees to join the 10 Squad as its existence is revealed.
  • In Revelation, she aids in removing Karin Frikton from her ship after it crash-lands in front of Cooper's house.
  • In Man in the Stone Mirror, she joins Ben in attempting to track down Chelsey Tennyson after she'd been captured by Sii.
  • In Threat or Menace, she appeared only in the beginning where she'd driven the DX Mark 10 from Mr. Smoothy's, drinking her smoothie at Ben's house with Ben, Gwen, Kevin, and Chelsey.
  • In Ben 10: Alien Universe Unleashed, she is killed in the last stand with Albedo.
  • In Maximum Slumber, when Ben forces Professor Paradox to bring him back to the events of Ben 10: Alien Universe Unleashed, he tries to revive her with Healding but fails due to how her DNA changed from the merge with Ken.


Back in Action: Alien Universe[]


  • The special relationship she shares with Ken makes her DNA confusing to parse, even for skilled Anodites and magic users like Chelsey Tennyson.
  • Julie is Japanese-American.
  • In The Sea's the Limit, the scanners that analyze Ben (as Buzzshock), Gwen, Kevin, and herself, say she is recognized solely as a Galvanic Mechamorph, as opposed to Human-Galvanic Mechamorph hybrid (like Kevin and Gwen, who respectively received Human-Osmosian and Human-Anodite).
  • She would have turned 17 in July 2013, the summer during which much of season 2 takes place.
Created by COLOR
Alien Universe (BTAU - BiA - SiC) - Clad in Darkness - Benjection - DC's Hero of Heroes
Episodes and Shorts of Back in Action: Alien Universe
Season 1 Infernosphere - Limited - Magikfest - No Strings Attached - The Sea's the Limit - Hit and Miss - Dial Z for Zombified - Ten Plus Twenty - Happily Never Happened - Missing Link - New Girl - Revelation - Man in the Stone Mirror - Threat or Menace - The Alternative - Why Am I Here? - Love Stuck - Ultimate Solution - Overcoming Adversaries - Ledger Recon - Welcome to Chronospect - Prelude of the Unleashed - Ben 10: Alien Universe Unleashed
Season 2 Meet the Replacements - Hooking Up With the K's - The Armaggedroid - Fate of the Helpers - Madame Regle - Leaked - Shades of Dawn - Foreverlasting - Can't Trust the Weather, Man - Plight of Pinocchio - Maximum Slumber - Dusk - Escalation - Malevolence - Never Set in Stone
Season 3 Adrift - Marooned - Hall of Mirrors - Benjamin's Island - Skeletons - ...Enjoy Such Liberty - Welcome to Omnitropolis - Time is of the Essence
Shorts Meet the Fans - Operation Pyros - Moira's Presents - Clock Worked - Unity Broker - Why Did the Chicken Cross the Road? - Azmuth's Plumbing - Zennith, Creator of the Omnitrix - The Great Tram Robbery
Unique Aliens in Back in Action: Alien Universe
First used by Super Ben (Assault Omnitrix) Obsorber - Nigester - Plastikitee - Anos - Streak - Bugbite - Muckslide - Autosassin - Ultimate Upchuck - Clinger - Healding - Alkamine - Brawnoceros - Combustiball - Cardstruct - Dreadsense - Frisbit - Koldiak - Plasmodic - Seismix - Wavelength - Warrock - Fetterwing - Suctionrupt
Majestic Forms TBD
First used by Dawn (Alphaline Omnitrix) Vertigo - Starhavoc - Slyt - Blankslate
First used by Future Ben Atomhammer - Ultimate Brainstorm
Characters in Back in Action: Alien Universe
10 Squad Ben Tennyson - Gwen Tennyson - Kevin Levin - Julie Yamamoto - Chelsey Tennyson - Max Tennyson - Cooper Daniels - Ken
Villains Future Ben - Thep Khufan Commander - Scarogus - Dawn - Vilgax - Albedo - Malevolence - Darkstar - Sii - Elena Validus - Dr. Animo - Cyanne - Mistress - Hurricane Vance - Project Inferno - Nightcaster II - Clancy - Metalink
Supporting Characters Professor Paradox - Azmuth - Charmcaster - Eunice - Verdona - Rex - Sir George
Other Timelines/Possible Futures Gwen 20 - Upgrade Ben - Altrazon - Jennifer-Mercedes Tennyson
Groups Second Gynurans (Eli Griswold - Aion) - Omega Squad - Plumbers (Karin Frikton - Io) - Thep Khufan Armada - Board of Galvan
Others Chili - Moira Yourouguaduan