Katherine Langford as Kelly

Miles Heizer as Octavian

Alexander Skarsgård as Apollo

Gemma Arterton as Persephone

Wesley French as Tristan McLean

Troye Sivan as Hyacinthus

Catherine Deneuve as Medea

Justin Prentice as Triton

Brenda Strong as Amphitrite

Dylan and Cole Spouse as Connor and Travis Stoll

Michael Keaton as Kronos Titan

Aiden Turner as Orion