Harold believes that the picture day photographer is somehow turning the kids into well behaved zombies.
Tropes
- The Cameo: Carrie, Devin and Chet from The Ridonculous Race appear in Harold's alien comic; however, Carrie's and Devin's designs are slightly modified.
- Continuity Nod: Leshawna is sporting the same hair style she had in "Gum and Gummer".
- Extreme Omnivore: The alien-infected kids and Chef eat virtually anything that's not meant for human consumption, such as phones, potted plants, and toys.
- Humiliation Conga: After Harold and Izzy save Beth, the aliens get stomped on by Izzy, eaten by birds, and have their saucer towed away.
- Mythology Gag: Courtney is wearing a tiara, much like her older self did in "The Princess Pride" and "Niagara Brawls".
- Puppeteer Parasite: The slug-like aliens that infect the daycare.
- Reused Character Design: Besides Carrie, Devin and Chet, one of the aliens' victims in Harold's comic book resembles the recurring unnamed female flight attendant with a casual outfit and an Ambiguously Brown skin tone.
- Shout-Out:
- The episode's title is a reference to the classic sci-fi horror film Invasion of the Body Snatchers.
- One of the aliens' victims in the comic heavily resembles Newman from Seinfeld.
- Something We Forgot: Cody is nowhere to be seen in the climax where Harold manages to save everyone from the brainwashing worm aliens. He reappears when it's time to take a class photo, and to everyone's horror, he's still infected.
- The Trouble with Tickets: The aliens get more than a dozen parking tickets after landing their saucer in the daycare's parking lot.
