THE XJ LINE

Jenny's sisters (XJ-1 to 8) are actually prototypes that Mrs. Wakeman created before Jenny. As such, they all have minor flaws and distinct personalities. Jenny first discovers she has sisters in "Sibling Tsunami." Her sisters show up again later in "Sister Sledgehammer", where they try to free her from the clutches of the Cluster. They are all defective which caused Mrs. Wakeman to deactivate them. Because of Jenny's advancements, they are considered to be Jenny's younger sisters, however they are technically older than Jenny.

'XJ-1' (also played by Janice Kawaye) is the smallest sister and is basically an egg-shaped baby robot. She can neither talk nor fight and is easily frightened by most villains she comes face to face with. She expresses this fear by crying and developing an oil leak.

'XJ-2' (Kath Soucie) is the second sister. She can fly and has a powerful laser gun, but she suffers from chronic hiccups. These hiccups endanger everything around her from being destroyed by the laser. Like XJ-1, she can't speak.

'XJ-3' is the third sister and the first to take on a more humanoid shape. Unfortunately she's not as solidly built as the other XJ's and tends to fall apart quite often. Like XJ-1 & XJ-2, she can't speak.

'XJ-4' (also played by Kath Soucie) is a household robot who prefers cleaning over fighting. She often quarrels with XJ-6.

'XJ-5' (also played by Kath Soucie) is a flying robot head that appears to be the smartest of the XJ's, next to Jenny. She's rather talkative and often gets on the nerves of her sisters and others.

'XJ-6' (Candi Milo) acts like a spoiled teenager and is very jealous of Jenny, though she would never admit that herself.

'XJ-7' (Audrey Wasilewski) has a very depressed personality. She's pessimistic about everything that happens around her, which doesn't exactly make the ones she is supposed to protect feel safe (an homage to Marvin the Paranoid Android, who she actually directly quotes).

'XJ-8' (also played by Audrey Wasilewski) is the biggest and physically most powerful sister. She talks like the standard robot would and tends to be strict in following her purpose (that is, to fight evil).
In ''A Robot for All Seasons'', there was a visual gag in which Dr. Wakeman was looking over design plans for an XJ-10. This, however, is considered to be a joke that the writers threw in, as any such plan for an XJ-10 was never mentioned again since.