Appearance: Unlike most of her blue/aquamarine sisters, XJ-4 features a unique lavender and white color scheme. Instead of a standard humanoid torso or set of legs, she moves around on a single monopod/wheel base. She is also one of the few XJ units besides Jenny to have a visible moving mouth.

Abilities: XJ-4's internal compartments hold virtually every type of cleaning supply, brush, spray, and vacuum imaginable. In battle or group efforts, she often wields cleaning utensils as improvised tools or weapon systems alongside her sisters.

Notable Episode Appearances

• "Sibling Tsunami": Her debut episode, where Jenny discovers her eight older sisters stored away in Dr. Wakeman's basement.

• "Sister Sledgehammer": Joins forces with the other XJ series models to save Jenny and defend the planet.

• "Turncoats": Features in the repair scene where she famously asks Dr. Wakeman if she can get an upgrade to spray Scrubbing Bubbles.