XJ-1, XJ-2, XJ-3, XJ-4, XJ-5, XJ-6, XJ-7 and XJ-8

Jenny is the ninth model of the XJ android series, but when she discovers a hidden room in her mother's basement laboratory, Jenny finally realizes she has the XJ-Sisters, which are prototypes of her. Jenny (XJ-9) is referred to as the eldest sister, despite being made as the ninth experiment. In regards to maturity and responsibility, Jenny represents the eldest sister.

The XJ-Sisters make their first appearances in the Season 1 episode, "Sibling Tsunami", and go on to appear in "Sister Sledgehammer", "Agent 00' Sheldon" and "Escape from Cluster Prime" (mostly cameo), and notably "Turncoats." (XJ-8 also appears briefly in "There's No Place Like Home School").

In "A Robot For All Seasons," Nora Wakeman was seen designing plans for an XJ-10 after Jenny was believed to have gone renegade due to falling under the control of Todd Sweeney. However, XJ-10 was never actually created.

List of XJ-Sister Robots


  • Nora Wakeman presumably started building the XJ-Sisters to replace Armaggedroid in order to create a new robotic Earth defender due to him going rogue.
  • In the Russian version of Season 3, XJ-4, XJ-6, XJ-7, and XJ-8 were all voiced by a male actor.


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