Digimon: Digital Monsters

Kari has recurring nightmares and warps into the Dark Ocean, a world separate from the Real and Digital Worlds. The Scubamon ask Kari to free them from Ken's control, and they are attacked by an Airdramon. T.K. enters the Dark Ocean to rescue Kari and destroys the Control Spire, but once the Scubamon are freed, they attempt to abduct her into serving as their queen to their master, Dragomon. The two, along with their Digimon, escape.