Una tímida adolescente descubre que forma parte de la legendaria realeza de los míticos Kraken, los señores del mar, y que su destino en las profundidades del océano es mucho mayor de lo que jamás había soñado.

Ruby Gillman, a sweet and awkward high school student, discovers she's a direct descendant of the warrior kraken queens. The kraken are sworn to protect the oceans of the world against the vain, power-hungry mermaids. Destined to inherit the throne from her commanding grandmother, Ruby must use her newfound powers to protect those she loves most.