Fifteen-year-old Ruby Gillman learns that she is in the next ... a mermaid-turned-human who enrolls at Oceanside High School.

The film centres on Ruby Gillman, a young kraken hiding in plain sight in the human town of Oceanside. She’s blue, likes maths, wears a retainer and has four long fingers that look like hot dogs.

Ruby Gillman (voice of Lana Condor) is a sixteen-year-old who lives in Oceanside with her mother ... and befriends a new girl in school (voice of Annie Murphy) who shares a connection with her ...