The turtles find April's long-lost mother frozen in a Kraang Stealth Ship buried under the farmhouse, though Mikey doesn't trust her and senses there's something wrong, he follows her into the woods where she's spilling a canister of mutagen, later it's revealed it's not really April's mom, it's an experimented clone with Mrs. O'Neil's memories. The creature is defeated by April with a psychic blast.Buried Secrets.
- Renae Jacobs, who voiced Mrs. O'Neil, had originally portrayedApril O'Neil in the original 1987 series.
- The episode is inspired by films like John Carpenter’s The Thingas April’s mom turns out to be more than what she seems.
- Both the Thing and Mom-Thing were found frozen and came from an alien spaceship.
- Raphael calls the creature "Mom-Thing" as a nod to the movie title itself.
- Many parts of the creature's body were taken directly from the Thing's various forms throughout the film.
- The creature's tiny spikes pop out in a similar way to the spider legs that first appear in the film popping out of the Thing's dog form.
- When Bennings is taken over by the Thing and stumbles on the snow as the imitation process is incomplete, we see him with monster hands similar to Mom-Thing's hands.
- The long neck resembles the scene where the Thing busts through Norris' chest with a smaller weird version of his head.
- The splitted head references the blood test scene, where Palmer is proven to be an imitation and the Thing splits its head in two, killing windows Windows.
- The turtles faces being revealed coming out of it's body resembles the last scene we see the Thing and it reveals a dog coming out of it's guts.
- The big red tentacle thing the creature uses to absorb Casey and Raph also appears in the film.
- As the characters in the film did, Casey tries to fry the creature, though it didn't work this time.
- The creature broke into the barn from the underground, as an homage to the Thing's last desperate attack in the film.
- Her monster face bears a resemblance to the alien's from They Live!, another of John Carpenter's films.
- "Mrs. O'Neil" acted similarly to Ross Rose from the 1980 horror film Mother's Day.
- The quote "You made Mother very angry." is taken directly from Mother's Day.
- Her true form also resembles several creatures from the Silent Hill video games.
- The "One of us" chant used when Mrs. O'neil's clone was trying to convince April to join them, was taken from Freaks, a 1932 horror film, where the characters chanted "Gooba-gobble, gooba-gobble. We accept her. One of us, one of us.".