Dr. Stephen Strange casts a forbidden spell that opens the doorway to the multiverse, including alternate versions of himself, whose threat to humanity is too great for the combined forces of Strange, Wong, and Wanda Maximoff.

Ariel is a fun-loving and mischievous mermaid who is enchanted with all things human. Disregarding her father's order to stay away from the world above the sea, she swims to the surface and, in a raging storm, rescues Prince Eric, the man of her dreams. Determined to be human, she strikes a bargain with the devious sea witch, Ursula, and trades her fins and beautiful voice for legs. With her best friend Flounder, and her reluctant chaperon Sebastian...