ADELE EXARCHOPOULOS as NIXIE TRITONSDATTER
HALLE BAILEY as ARIEL TRITONSDATTER
JOMAH HAUER KING as PRINCE ERIC
JAVIER BARDEM as KING TRITON
MELISSA MCCARTHY as URSULA
DAVEED DIGGS as SEBASTIAN
JACOB TREMBLAY as FLOUNDER
and everyone else as themselves.