Sonic the Hedgehog

On a distant planet,^[c] Sonic the Hedgehog, an anthropomorphic blue hedgehog who can run at supersonic speed, is chased by a tribe of echidnas. His guardian, Longclaw the Owl, gives him a bag of rings that open portals to other planets. She uses one to send him to Earth while she stays behind to hold off the echidnas.

Ten years later, Sonic enjoys a secret life near the town of Green Hills, Montana, but longs to make friends. He idolizes the local sheriff, Tom Wachowski, and his flexible veterinarian wife, Maddie, unaware the pair are to relocate to San Francisco as Tom plans to accept a post with the San Francisco Police Department.

One night, Sonic grows upset over his loneliness while playing baseball alone and inadvertently triggers an electromagnetic pulse which causes a massive power outage across the Pacific Northwest while running at high speeds. The United States Department of Defense reluctantly enlists the services of eccentric roboticist and scientific genius Dr. Robotnik to determine the cause. Seeing he is being hunted, Sonic tries to leave Earth for a "mushroom planet". Tom discovers Sonic in his shed and accidentally shoots him with a tranquilizer dart, causing Sonic to drop his bag of rings into a portal to the Transamerica Pyramid's roof upon seeing a picture of said building. Tom hesitantly agrees to help Sonic and the two flee when confronted by Robotnik, who falsely labels Tom a domestic terrorist. The two slowly bond, with Tom relating to Sonic's desire for friends. Sonic creates a bucket list and Tom helps him complete several entries along their journey.

Meanwhile, Robotnik, discovering that one of Sonic's quills holds an almost limitless amount of electrical energy, plans to capture Sonic to use his powers for his machines. As he tracks them down, Sonic and Tom manage to fight off several mechanized pursuit drones sent by Robotnik, but Sonic is injured in the battle.

Arriving in San Francisco, Tom brings Sonic to Maddie, who treats him at her sister Rachel's home. Sonic receives a new pair of red sneakers to replace his ruined ones from Jojo, Maddie's niece. The group heads to the roof of the pyramid and recovers the rings as Robotnik arrives in an advanced attack hovercraft powered by the quill. Sonic fights off Robotnik's drones and uses one of his rings to send Tom and Maddie back to Green Hills to protect them, but Robotnik uses the quill's power to match Sonic's speed. Sonic engages Robotnik in a chase across the world before Robotnik subdues Sonic in Green Hills. Tom and the townsfolk intervene, and Tom acknowledges Sonic as his friend, causing Sonic to regain his strength. Sonic takes back his quill's power from Robotnik, weakening Robotnik's hovercraft and making the quill useless. Using his powerful spin attack, Sonic then knocks Robotnik into a portal to the mushroom planet. Following the incident, Tom and Maddie decide to stay in Green Hills and let Sonic live with them. The government erases all evidence of the events, including records of Robotnik's existence.

In a mid-credits scene, three months later, Robotnik is still in possession of Sonic's quill and usable equipment salvaged from his ruined hovercraft. While shaving his head, and growing out his mustache, he swears to exact revenge against Sonic. Sometime later, Miles "Tails" Prower emerges from a ring portal on Earth to search for Sonic, leading into Sonic the Hedgehog 2.