Science of Mashed Killer Potatoes

Science of Mashed Killer Potatoes is the fifth episode of the first season of Toby and Rochelle: 9th Grade Ninja Twins. It first aired on September 25, 2021.

Synopsis
Karen want to win a science fair, but things don't go as planned after Mr. Einstein; the substitute science teacher, pairs her up with another GIRL! Now she's got to make it through this without getting touched her science stuff. Or fallible in love!

Plot
Toby fights a robot, smokebombs to temporarily escape from it, and enters the NinjaNomicon in order to get help. He uses the chain-sickle but failed, then used a shovel on the robot and won. He finds the fart box and keeps it to show Howard later. In science class, Karen was about to partner up with Rochelle for a science project. The winning science project would get a trip to Bug Camp. However, it was discovered that Mr. Einstein (who is subbing the regular Home EC teacher) already chose the partners for the weekend; Toby and Howard, Hal and Vikki (much to Rachel's frustration) Zach and Bucky, Zoe and Oliver (much to their frustration) Hannah and Bash, Becca and Petunia, Kevin and Barry, Rachel and Doris (who is skipping class again and forced Rachel to be a single mother) and lastly Rochelle and Lincoln, much to Karen's shock, was to partner with a girl named Tonya.

Major characters

 * Ben Schwartz as Toby Brooks / Red Ninja
 * Kimberly Brooks as Karen Boonchuy
 * Heather Arney as Rochelle Brooks
 * William Salyers as Howard Cunningham
 * John DiMaggio as Timmy McFist (debut)
 * Tom Kenny as Professor King
 * Lisa Schwartz as Tonya Griffin (debut)
 * Robot (debut)
 * Cat-Poop-Powered Robot (debut)
 * Potato monsters (debut)
 * George Back as Derek Houston (debut)
 * James Adomian as Ronnie Michelson (debut)

Supporting characters

 * Fred Tatasciore as Mr. Einstein
 * Jim Rash as Principal Jinkins
 * Jason Spisak as Hal Jordan
 * Ashley Tisdale as Vikki Tisdale
 * J.G. Quintel as Zach Hunnicutt
 * Scott Menville as Bucky Hangslinger
 * Kari Wahlgren as Zoe Danvers
 * Eddie Perino as Oliver Queen (debut)
 * Lisa Schwartz as Hannah Cunningham (debut)
 * Steve Oedekerk as Bash Johnson
 * Maria Bamford as Becca Baxter
 * Cree Summer as Petunia Summer
 * Sean Penn as Kevin Hall
 * Phil LaMarr as Barry Allen/Flash
 * Lea Michele as Rachel Michele
 * Andrew Caldwell as Lincoln Weinerman

Trivia

 * Coming up.

Quotes
Main article: Science of Mashed Killer Potatoes/Transcript