Shelby: Sweet Mother of me!
Cyd: Mommy Fearest is Astrid!
When Cyd and Shelby go to a roller derby against Astrid’s wishes, they find out that Shelby’s mom has been keeping a secret.
- Lauren Taylor as Shelby Marcus
- Landry Bender as Cyd Ripley
- Gus Kamp as Barry Eisenberg
- Ricky Garcia as Naldo Montoya
- Benjamin Royer as Bret Marcus
- Matthew Royer as Chet Marcus
- Astrid Marcus participates in female Roller Derby matches under the identity of "Mommy Fearest."
- Daisy's royal gown has been cleaned since Princess Problems.
- Shelby had a roller party for her ninth birthday, but dropped the activity as Cyd could never learn to skate.
- Barry and Naldo have engaged in prank wars since the fifth grade.
- The other Roller Derby participants were portrayed by members of the LA Derby Dolls.
- Astrid places a large heart-shaped meatball in the center of her five-hour-lasagnas.
- The Marcus family have a neighbor nicknamed "Paintball" Preston.
- Daisy collected a hundred leeches from the Columbia River.
- The subplot of Barry and Naldo wanting to be knights parallels the subplot of the Lab Rats episode Face Off, where Douglas and Leo compete to be Vice President of Donald Davenport's company. Just like in that episode, Barry and Naldo go through a series of elaborate, yet humiliating challenges to be knighted by Daisy, similar to how Donald puts Leo and Douglas through tests of similar nature. In addition, Daisy/Mr. Davenport reveals that the position Barry & Naldo/Leo & Douglas was seeking did not exist, and that the "tests" were all a prank to teach them a lesson.
- December 10, 2016 (Hungary)
- December 19, 2016 (Israel)
- January 4, 2017 (Latin America, Brazil)
| To view the Derby Little Secret gallery, click here.