The XJ-Sisters make their first appearance in the first season 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").
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 Nicktoon to feature a large amount of sisters in the main character's family (10), the second being the Loud House, featuring 10 sisters (also).
- In the Russian dub of season 3, XJ-4, XJ-6, XJ-7 and XJ-8 were all voiced by a man.