While the Turtles and April O'Neil are staying at the O'Neil family farmhouse, they discover a hidden basement. Inside, they find a woman who appears to be April’s long-lost mother, trapped in stasis. However, it is eventually revealed that "Mom" is actually a shapeshifting Kraang creature that has consumed the real Mrs. O'Neil's memories and DNA. Release Date: It first aired on November 7, 2014.

This episode is widely recognized by fans and critics for its intense horror themes and gross-out visuals, drawing heavy inspiration from John Carpenter’s The Thing .

The episode features a "Mom-Thing" monster that undergoes grotesque physical transformations, mirroring the practical effects of classic 80s horror movies.