Ben 10 Fan Fiction Wiki
Ben 10 Fan Fiction Wiki

Chelsey Jae Tennyson is Charmcaster's longest and best friend, as well as the magical second cousin of Gwen and Ben Tennyson. She appears in Back in Action: Alien Universe.


This section is incomplete.


A free spirit like many Anodites, especially her grandmother, Chelsey is a lover of older music. In addition, she is extremely lax, whether it be in relationships or with the tenuous line between legal and otherwise. She constantly considers how what she's doing affects her family - without the money, they'd have been on the streets for a decade now.



Since she was five years old, she has known her great aunt Verdona, having been introduced through her Anodite parents.

She grew up in Colorado, out of sight of the other Tennysons. There, when she was 8 years old, she met her to-be best friend Charmcaster, who for a long time she only knew by "Hope." As Plumbers, Chelsey's parents did not (and to this day, do not) make too much, making it difficult to financially support the family. As such, through the years where one, two, three, and now four sisters have joined her, Chelsey schemed alongside Charmcaster for valuable treasures or cash to help pay the bills.

Her family eventually moved to Bellwood to rekindle ties with the other Tennysons, and simultaneously, she met Ben, who extended a helping hand.

Back in Action: Alien Universe[]

This section is incomplete.
  • In Magikfest, she fights alongside Charmcaster and soon meets the rest of her family.
  • In Can't Trust the Weather, Man, a date with her new boyrfiend is cut short so she can charge in to defend Bellwood from Hurricane Vance.
  • In Plight of Pinocchio, hanging out with Ben (which was also supposed to include an absent Mercedes) is truncated by a call from Kevin about Charmcaster trying to kill Gwen. When she goes to end the fighting, they end up in an elongated battle with Eunice where Chelsey and Charmcaster's bickering causes them to reveal their true feelings for each other but also somewhat part ways.
  • In Malevolence, she joined Gwen, Kevin, and Mercedes to help Ben push back against Vilgax and Malevolence in their quest to break out of Null Void Incarcecon.

Seventeen in College[]


Back in Action: Alien Universe[]


Seventeen in College[]


  • In Plight of Pinocchio, it is suggested Chelsey and Charmcaster have mutual romantic feelings for each other, though that may have waned after Chelsey began dating her new boyfriend.
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