When the Mystery Inc. gang is invited to Spooky Island, a popular amusement park, they soon discover that the attractions aren't the only things that are spooky. Strange things are happening, and it's up to Scooby, Shaggy, Fred, Daphne, and Velma to uncover the truth behind the mysterious happenings.
Megan's world is turned upside down when she hears her calm life with her little brother and single mum is about to change. She hears she's soon to have a stepfather and a stepsister. Megan thinks they're a bit weird and is determined to stop the wedding. She discovers they're actually even stranger than she thought - they're from another planet.
A scientist desperately wanting to prove that mermaids exist is ostracized from the scientific community in Japan. He settles down in Australia steadfast on his hypothesis. When a Japanese student visits him in Australia with strange questions about mermaids, how the young man survived in the ocean, and why he doesn't remember anything.
