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KO gets more than he bargained for when he gets a sidekick.
- Combo Breaker
- Darrell (imagined)
- Shannon (imagined)
- Raymond (imagined)
- Crinkly Wrinkly
- Dogmun (cameo)
- The Director (cameo)
- Chip Damage (pictured)
- Gregg (powcard)
- Nick Army (powcard)
- Mr. Gar (powcard)
- Red Action (powcard)
- Ms. Mummy (powcard)
- Garnet (powcard)
- Potato (powcard)
- K.O. still owns Garnet's powcard after the events of "Crossover Nexus".
- K.O. recalls about Nick Army letting him drive his tank from "Be a Team".
- K.O. remembers that Red Action got him chips from "Back in Red Action".
- K.O. is disappointed with Chip Damage after the events of "Final Exams".
- Enid and Rad wore the same chefs outfits from "We're Captured" when preparing a cake.
- The bodega continues to have the small delivery catering from "Special Delivery".
- Enid pointed out about K.O.'s former immature behavior from previous events when he first joined the bodega.
- Professor Venomous collaborates with the robot attack after events from "All in the Villainy", as shown with Jethro's organic new lips.
- Boxmore has a sign outside reading "Box it Venom" as the slogan since Lord Boxman and Professor Venomous are continuing their business.
- Combo Breaker mentioned Joe Cuppa was "world famous" referring to when he made a comeback from "Presenting Joe Cuppa" and guest appearing from "Let's Watch the Pilot".
- This episode includes several references to popular anime and manga:
- Combo Breaker takes clear inspiration from Astro Boy, one of the most popular early manga written by Osamu Tezuka. He also happens to be voiced by Candi Milo, who played Astro Boy himself in the 2003 anime dub.
- While Combo is introducing himself, K.O.'s reaction is to make the Excalibur Face expression, a visual motif taken from the manga and anime Soul Eater!, that became a meme in online fandoms.
- Besides his general design, Combo's expressions also take cues from anime, seeing bubbles when looking longingly at K.O., or having his tears sparkle when he cries.
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