Neri and Mera make the decision to return to the Ocean Planet and convince Diane that her research must continue. Froggy fixes HELEN, with a little help from Damien.
Commander Byrne has Forsythe arrested when HELEN identifies him as the saboteur.
The kids take care of Liselle, keeping her from contacting UBRI. Neri and Mera are taken back to the island, with Winston, Mick and Zoey acting as decoys to keep UBRI away.
Final goodbyes are said as the girls board the spacecraft for home but after the ship leaves, one person has stayed behind. Neri says she must stay to "finish father's work."