Mermicorno: Starfall: Season 1, Episode 12 - Underwater Pressure (2025)

The episode centers on a creature that exploits the Mermicornos' anxieties, forcing them to confront their own fear, doubt, and worry rather than a conventional external enemy. The recap notes that the creature reveals itself as a projection of their feelings, which makes the emotional pressure the key plot device rather than a physical threat alone.

Sawtooth is trying to drain the last fallen star while the Mermicornos are dealing with the anxiety creature. Both the Rotten Tomatoes synopsis and the Fandom episode page describe his goal in this episode as draining that final star, making it the main action on his side of the story.

The episode focuses on the Mermicornos as a group, but the recap specifically mentions Astra, Kameko, Squishella, Nautique, Gwen, and others as they each face the pressure in different ways. The creature's effect culminates in the group acknowledging their fears openly, with Astra realizing Kameko was right before they all admit what they are feeling.

Astra realizes that Kameko was right, and that the frightening presence they are facing is tied to their own internal emotions. That realization becomes a turning point, because it helps lead the group to admit their doubt, fear, and worry instead of suppressing them.

Once Astra returns to the others, they all openly admit their feelings, which the recap identifies as doubt, fear, and worry. The group then passes their challenges one by one, showing that honest self-expression and mutual trust help them push through the episode's pressure.