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-VII 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-X after Jenny was believed to have gone renegade due to falling under the control of Todd Sweeney. However, XJ-X was never actually created.
List of Robots
- Nora Wakeman built each of the XJ-Sisters to replace Armaggedroid due to him going rogue.
- My Life as a Teenage Robot is the first Nickelodeon animated show to feature a large amount of sisters in the main character's family, the second being the Loud House featuring a larger amount.
- In the Russian version of season III, XJ-IV, XJ-VI, XJ-VII, and XJ-VIII were all voiced by a male actor.