Professor Hermes conducts a research on fear, for which he passes contract with a patient to live a supposedly empty mansion. He's counting on his assistant Chico Mota to play a phantom, but soon comes about that there are phantoms (plural) in there.
After a family tragedy, three generations of the Deetz family return home to Winter River. Still haunted by Betelgeuse, Lydia's life is turned upside down when her teenage daughter, Astrid, accidentally opens the portal to the Afterlife.
Casper is a kind young ghost who peacefully haunts a mansion in Maine. When specialist James Harvey arrives to communicate with Casper and his fellow spirits, he brings along his teenage daughter, Kat. Casper quickly falls in love with Kat, but their budding relationship is complicated not only by his transparent state, but also by his troublemaking apparition uncles and their mischievous antics.
Scooby-Doo and the Mystery Gang visit Oakhaven, Massachusetts to seek strange goings on involving a famous horror novelist and his ancestor who is rumored to have been a witch.
While holding a séance for skeptical novelist Charles Condomine, self-proclaimed 'spiritualist medium' Madame Arcati inadvertently summons the spirit of his deceased first wife Elvira, leading to an increasingly complex love triangle with Ruth, his current wife of five years.
On her 13th birthday, Marnie learns she's a witch, discovers a secret portal, and is transported to Halloweentown — a magical place where ghosts and ghouls, witches and werewolves live apart from the human world. But she soon finds herself battling wicked warlocks, evil curses, and endless surprises.