Before there was XJ-9, there was XJ-8, and before her, there was XJ-7, XJ-6, XJ-5, XJ-4, XJ-3, XJ-2 and finally, XJ-1. When Jenny finds and reactivates her sisters, she is beyond happy. But each sister has her own personality, and not all of them have the same level of friendliness that Jenny has. Still, sisters can be counted on, right?
Jenny: And this is XJ-8. She's the closest to me in age, but she's still my little sister.
XJ8: It would appear that I am larger than you, therefore I am the bigger sister, and you are the little sister. The puny, scrawny, inferior—
Jenny: Yeah, ok, really, but she still looks up to me.
XJ8: Actually, since I am taller than you...
XJ8: This human was blindfolded and was using a stick type weapon to vandalize a colorful paper pig.
Jenny: (annoyed) Ohh, it's a game, XJ-8!
Jenny: After all the bad stuff I said...
XJ-8: That's what sisters are for.
XJ-6: Oil is thicker than water.
XJ-4: But so much harder to get out of a carpet.
XJ-5: A few harsh words aren't going to break up the XJs!
(after noticing XJ8) Brad: Jenny?
Jenny: Hey guys, I'd like you to meet my sisters!
Brad: But we thought you were an only child?
Jenny: Me too. Guess mom was holding out on me!
Jenny: This little sweetie is XJ-1. (XJ-1 starts crying) Somebody needs her oil changed!
Jenny: Hey XJ-7, what's got you down? XJ7: Oh, life, the universe, everything.
Ms. Wakeman: Goodnight XJ1, 2, 3, 4, 5, 6, 7, 8, 9. And, goodnight XJ-10!
Wakeman: Kidding. Just kidding!
XJ5: XJ-1, grease the slice! XJ-8, use your muscle! XJ-2, do your stuff! Tidy up, XJ-4! OK, XJ-3, check the workmanship!
- When Jenny was reading the note left by Dr. Wakeman, at the end she read "Love, Mom." But it actually said "Yours, Wakeman." Additionally, according to the note, Dr. Wakeman left motor oil for XJ9 in case she got thristy. When we see her drinking it, however, it's actually a can of WD-40, an abrasive.
- Technically speaking, XJ-9 is the youngest in the XJ series, and XJ-1 is the oldest, as XJ-1 was built first.
- XJ-7 and XJ-8 are voiced by Audrey Wasilewski, who also voices Tuck.
- This episode reunites Janice Kawaye and Kath Soucie, both of whom voice Gi and Linka in Captain Planet and the Planeteers.
- The Mad Hammer Bros. are a parody of the Mario Bros. from Nintendo‘s Super Mario series.
- However, in appearance and demeanor, they more closely parody Wario and Waluigi (the evil alter egos of the Mario Brothers), in terms of their gruff and villainous personalities, ragged mustaches, and the Red Brother being stout and fat (like Wario), and the Green Brother being lanky and thin (like Waluigi).
- The jump sound effect from Super Mario World is heard when the Mad Hammer Bros. jump.