In this charming animated adventure, the four orphaned Alden children embark on a summer vacation that promises mystery and discovery. With their grandfather, Martin Sheen, they travel to a secluded island owned by a reclusive scientist, voiced by J.K. Simmons, where they are free to explore the untamed wilderness. Led by the resourceful Henry, voiced by Dane DeHaan, and his imaginative sister Jessie, played by Joey King, along with younger siblings Violet Talitha Bateman and Benny Carter Sand, the children delight in building a new home in a boxcar and uncovering the island's natural wonders. Their idyllic summer takes an intriguing turn as they begin to notice strange occurrences and encounter a mysterious stranger, hinting that Surprise Island holds secrets deeper than its sandy shores. Directed by Dan Chuba and Mark Dippe, the film weaves a gentle tale of family bonding, curiosity, and adventure, where the greatest treasures are found not in gold, but in friendship and the courage to unravel a captivating island enigma.