Deep Sea Feline follows Charlie Potichny, a failing musical artist living in Toronto, when a mysterious creature from another world visits him in his deceased mother's painting, gifting him with a song that will turn his life and musical career upside down. Charlie, not understanding the power and implications of the other world, upsets the delicate balance between ancient forces. Slowly, Toronto falls into chaos: the seasons go through drastic change, people are disappearing, and birds threaten to overtake the city.

To restore equilibrium and save their city, Charlie and a colourful cast of artists and musicians must uncover the mystery of Charlie's mothers mysterious suicide at her Cabin in Algonquin park, face their darkest fears, stage an epic opera, and navigate the strange and wondrous realms of the ancient gods.