Watch Online Free on Watchseries. In a story similar to C.S. Lewis' The Lion, the Witch and the Wardrobe, Splash and his sister Coral have long-awaited the return of the great whale King, but when young Splash lets a secret slip, the evil squid Krakken sets a trap! Using state of the art computer animation, Kingdom Under the Sea is a drama of great beauty and a message of great depth that your family will want to watch over and over again!