A NASA space probe lands on a distant planet and accidentally brings back a family of four extraterrestrial beings to Earth. The family gets separated, and the youngest alien ends up stranded on Earth, hiding in a newly moved-in family's home. The alien is discovered by a young, wheelchair-bound boy named Eric, who quickly forms a bond with the creature. Eric names the alien "MAC" (Mysterious Alien Creature) and soon realizes that MAC has special abilities and an urgent need to reunite with his family. Meanwhile, the government has launched a pursuit to capture MAC for scientific study, leading to a series of dangerous encounters.

With the help of his older brother Michael and their new friends Debbie and Courtney, Eric sets out on a mission to protect MAC from the authorities and find a way to send him back home. Throughout this adventure, the group must dodge relentless government agents while trying to understand MAC's mysterious powers. Their journey unravels a tale of friendship, courage, and the quest to reunite a lost alien with his family, all while navigating the challenges of keeping MAC hidden from prying eyes. The pursuit becomes increasingly perilous as they inch closer to their goal, forcing them to rely on each other’s strengths and MAC's unique abilities to evade capture.