Réalisation: William Lau
Quand les goules décident d'explorer la piscine de l'école, elles se retrouvent alors transportées dans un monde merveilleux fait de fleurs et de coraux. Mais Lagoona n'a pas le temps de contempler les fonds marins : elle doit affronter l'ennemi juré de son enfance, gagner une compétition de danse aquatique, et se battre contre un terrible monstre des mers.
Larissa Gallagher
Lagoona Blue / Kelpie Blue (voice)
Kate Higgins
Frankie Stein (voice)
Debi Derryberry
Draculaura (voice)
Salli Saffioti
Clawdeen Wolf / Cleo de Nile (voice)
America Young
Toralei Stripe (voice)
Evan Smith
Gillington Webber / Deuce Gorgon / Announcer #1 (voice)
Lyndsy Kail
Kala Mer'ri (voice)
Rachel Staman
Peri Serpentine (voice)
Cherami Leigh
Pearl Serpentine (voice)
Paula Rhodes
Posea Reef (voice)
Piotr Michael
Wade Blue / Dewey Blue / Squirt Blue / Tadpole Blue (voice)
Erin Fitzgerald
Abbey Bominable / Spectra Vondergast (voice)
Cam Clarke
Heath Burns / Hoodude Voodoo / Announcer #2 (voice)
Marcus Griffin
Clawd Wolf (voice)
Audu Paden
Ghoulia Yelps (voice)
Cindy Robinson
Jackson Jekyll / Meowlody / Purrsephone / Sea-Mares (voice)
Julie Maddalena
Robecca Steam (voice)
Larissa Gallagher
Lagoona Blue / Kelpie Blue (voice)
Kate Higgins
Frankie Stein (voice)
Debi Derryberry
Draculaura (voice)
Salli Saffioti
Clawdeen Wolf / Cleo de Nile (voice)
America Young
Toralei Stripe (voice)
Evan Smith
Gillington Webber / Deuce Gorgon / Announcer #1 (voice)
Lyndsy Kail
Kala Mer'ri (voice)
Rachel Staman
Peri Serpentine (voice)
Cherami Leigh
Pearl Serpentine (voice)
Paula Rhodes
Posea Reef (voice)
Piotr Michael
Wade Blue / Dewey Blue / Squirt Blue / Tadpole Blue (voice)
Erin Fitzgerald
Abbey Bominable / Spectra Vondergast (voice)
Cam Clarke
Heath Burns / Hoodude Voodoo / Announcer #2 (voice)
Marcus Griffin
Clawd Wolf (voice)
Audu Paden
Ghoulia Yelps (voice)
Cindy Robinson
Jackson Jekyll / Meowlody / Purrsephone / Sea-Mares (voice)
Julie Maddalena
Robecca Steam (voice)
Larissa Gallagher
Lagoona Blue / Kelpie Blue (voice)
Kate Higgins
Frankie Stein (voice)
Debi Derryberry
Draculaura (voice)
Salli Saffioti
Clawdeen Wolf / Cleo de Nile (voice)
America Young
Toralei Stripe (voice)
Evan Smith
Gillington Webber / Deuce Gorgon / Announcer #1 (voice)
Lyndsy Kail
Kala Mer'ri (voice)
Rachel Staman
Peri Serpentine (voice)
Cherami Leigh
Pearl Serpentine (voice)
Paula Rhodes
Posea Reef (voice)
Piotr Michael
Wade Blue / Dewey Blue / Squirt Blue / Tadpole Blue (voice)
Erin Fitzgerald
Abbey Bominable / Spectra Vondergast (voice)
Cam Clarke
Heath Burns / Hoodude Voodoo / Announcer #2 (voice)
Marcus Griffin
Clawd Wolf (voice)
Audu Paden
Ghoulia Yelps (voice)
Cindy Robinson
Jackson Jekyll / Meowlody / Purrsephone / Sea-Mares (voice)
Julie Maddalena
Robecca Steam (voice)