Ruby succeeds in retrieving the Trident of Oceanus but is betrayed by Chelsea, who reveals that she is Nerissa and that she escaped her imprisonment to manipulate a Kraken into helping her claim the trident in order to exact her revenge on the Kraken Kingdom. Nerissa sheds her disguise, trapping Ruby before going to destroy Oceanside.
Agatha and Grandmamah try to fight her off while Ruby goes to the surface to stop Nerissa. Nerissa overpowers Grandmamah and Agatha but is confronted by Ruby, who engages her in a duel over the trident. Nerissa gains the upper hand, but Ruby disarms her, realizing that the Trident can be destroyed with enough power. Ruby attempts to reason with Nerissa to no avail, so the trio combine their laser eyes to destroy the trident together, defeating Nerissa and shrinking her down to her normal size, where Gordon cages her.