प्लॉट

Sonic, Knuckles, and Tails reunite against a powerful new adversary, Shadow, a mysterious villain with powers unlike anything they have faced before. With their abilities outmatched, Team Sonic must seek out an unlikely alliance.

Sonic, Knuckles, and Tails reunite against a powerful new adversary, Shadow, a mysterious villain with powers unlike anything they have faced before. With their abilities outmatched in every way, Team Sonic must seek out an unlikely alliance in hopes of stopping Shadow and protecting the planet.

A top secret weapon, Project Shadow reawakens and cause destruction across the world. Team Sonic try to intervene but Shadow's powers are too much for the crew to handle. Sonic then decides to team up with Robotnik as they go on a global adventure to stop Shadow.

After being imprisoned for 50 years, the mysterious hedgehog Shadow escapes captivity and starts wreaking havoc all over the world. Now Sonic, along with Tails and Knuckles work with Team GUN to try and take him down. But when Shadow proves to be too powerful, Sonic and company have no choice but to team up with their old nemesis Dr. Robotnik in a difficult alliance. Now it's a race against time as Sonic must uncover the secret of Shadow and fight an enemy too powerful to defeat alone.—Blazer346

In 1974, a meteorite containing the alien hedgehog Shadow (Keanu Reeves) crash-lands in Oklahoma and is seized by the U.S. military. Shadow's power is experimented on by Professor Gerald Robotnik (Jim Carrey) at a Guardian Units of Nations (G.U.N.) research facility under the supervision of Captain Walters (Tom Butler) the former vice chairman of the Joint Chiefs of Staff and the leader of G.U.N.

Shadow also develops a close friendship with Maria (Alyla Browne), Gerald's granddaughter. One night, as Gerald, Maria, and Shadow try to escape the facility to prevent Shadow from being taken away, Maria is accidentally killed in an explosion. The explosion was caused by Gerald's experiments with Shadow's energy signatures. Walters shuts down the facility, imprisons Gerald, and places Shadow in suspended animation. Shadow was deemed too dangerous to be walking free and too valuable to destroy.

Fifty years later, in 2024, an unknown individual hacks into a G.U.N. prison facility's system off the coast of Japan and releases a vengeful Shadow. Kyle Lancebottom (Jorma Taccone) is a G.U.N. agent on Prison Island who watches over Shadow. Shadow hears the sounds of a guitar being played similar to what he heard during his time with Maria. Shadow comes out of his coma. Shadow has the power to "Teleport" from one location to another and easily defeats the security systems of G.U.N. designed to keep him imprisoned.

Shadow escapes the Island and enters the city of Tokyo, where he realizes that it is 2024 and that he has been held captive for 50 years. A huge contingent of the army arrives to take control of Shadow.

In Green Hills, Montana, Sonic (Ben Schwartz) celebrates the anniversary of his arrival on Earth with Tails (Colleen O'Shaughnessey) an intelligent anthropomorphic yellow fox who can fly with his twin-tails and creates gadgets that can alter appearances and disable security, Knuckles (Idris Elba) a hot-headed and arrogant anthropomorphic red Echidna warrior with super strength and the Flames of Disaster, a technique which allows his fists to burst into flames, and their adoptive parents Tom (James Marsden) and Maddie Wachowski (Tika Sumpter).

G.U.N. Director Rockwell (Krysten Ritter) arrives and recruits Sonic, Tails, and Knuckles (dubbed "Team Sonic") to help apprehend Shadow in Tokyo. However, he overpowers the three and escapes. Sonic is astonished to find that Shadow looks just like him. Sonic pursues Shadow, and the 2 hedgehogs come to a face-to-face collision creating an energy pulse of 1.21 Gigawatts. Sonic is defeated in the encounter and Shadow gets away.

Team Sonic meets with the now-Commander Walters, who informs them about Shadow's past. Walters says that while Sonic found friends and family on Earth, Shadow only found pain and loss.

Suddenly, Dr. Ivo Robotnik's (Jim Carrey) drones attack and fatally wound Walters, who gives Sonic a key-card before he dies. Walters says that the card controls the most powerful weapon ever built. When Rockwell arrives, she searches Walter for the key card, making Sonic suspicious. They decide to search for Shadow without G.U.N.'s help as Rockwell turns against them. Team Sonic encounters Ivo's assistant, Agent Stone (Lee Majdoub), who denies involvement in the attack and says that he was the one who saved Team Sonic from the drones. Stone tells Ivo that an impostor is using his drone technology. Ivo has grown a pot belly, lives in a filthy large drone crab, and has given up on basic hygiene. They form an uneasy alliance with Ivo and track the stolen drones to the abandoned G.U.N. facility.

Shadow was already at the facility and had met with Gerald. Shadow admits that he is still pained by Maria's death and Gerald says that this is why they have to team up to punish the humans.

Ivo encounters Gerald, his estranged grandfather and the mastermind behind Shadow's escape and the stolen drones, as Shadow captures the others. Gerald says that he was locked up in a top-secret prison facility for 50 years and hence could never contact Ivo.

Gerald explains that the key-card is one of two needed to activate the Eclipse Cannon, an orbiting laser space weapon he designed for G.U.N. (in exchange for his freedom), capable of targeting and destroying any location on Earth. He claims that he plans to use it to destroy G.U.N.'s headquarters in London to avenge Maria's death, and Ivo agrees to join him. Shadow takes the key-card from Tails and activates a miniature black hole to destroy the base as he, the Robotniks, and Stone leave. The 2nd key-card is inside G.U.N. HQ.

Team Sonic escapes using a ring portal and recruits Tom and Maddie to steal the second key-card from G.U.N.'s headquarters, contending with the Robotniks and Rockwell. G.U.N. HQ is protected by an energy shield and other traps, which Sonic cannot penetrate. Even a ring cannot penetrate the G.U.N. HQ as all schematics of the building have been erased specifically to stop penetration with the use of rings. So, Tails needs Tom and Maddie to install a USB drive in their IT servers to give him full control.

The Robotniks and Tom and Maddie enter the G.U.N. HQ at the same time. Tom installs the USB drive, but notices that the Robotniks had already installed their drive in the servers. Both the team reach the key-card room, along with Director Rockwell. Rockwell takes the key-card as Sonic is tied up in saving his team, while Ivo and Gerald are captured in a gravity well.

Tom successfully obtains the key-card by disguising himself as Walters ad ordering Rockwell to release the Keycard to him. Shadow takes Tom to be the real Walters, gravely wounds him, and takes the key, allowing the Robotniks to launch the Eclipse Cannon. Shadow realizes that the person he wounded was not Walters, but Tom and it triggered memories of a dying Maria in his mind. The Eclipse Cannon was buried underneath the Thames river, but Gerald activates the weapon and launches it into space.

Stone tries to warn Ivo that Gerald has not been completely honest with them, based on something that Shadow said. But Ivo ignores Stone and fires him instead.

The Master Emerald is a powerful ancient artifact, distinct from the Chaos Emeralds. It is a source of immense power, capable of performing feats like neutralizing chaos energy, Teleporting, and generating power.

Sonic abandons Tails and Knuckles, steals the Master Emerald from Angel Island, and becomes super-powered using the seven Chaos Emeralds contained within. Sonic confronts Shadow, who also absorbs the Chaos Emeralds' energy to become super-powered. Sonic eventually overpowers Shadow but relents upon realizing he was being consumed by revenge. Sonic tells Shadow about the loss of his guardian Longclaw and that their love for the people they have lost is more important than revenge. Having a change of heart, Shadow agrees to help stop the cannon.

Aboard the Eclipse Cannon, Gerald intends to destroy Earth to avenge Maria's death. A horrified Ivo attempts to abort the firing sequence, preferring to rule over humanity rather than destroy it, but Gerald destroys the command console. Gerald and Robotnik fight, until the latter is seemingly thrown to his death. However, Tails and Knuckles arrive and save Robotnik, and the trio knock Gerald into the energy beam powering the Eclipse Cannon, which evaporates him instantaneously.

Sonic and Shadow block the cannon's beam as Ivo, Tails, and Knuckles steer it away from Earth, accidentally slicing off part of the Moon. Sonic loses his super-powered form and consciousness while blocking the cannon's beam with Shadow and falls back to Earth. Tails and Knuckles save Sonic using a ring portal to Green Hills. When the cannon's core begins to melt down, Ivo makes a final announcement acknowledging Stone as his only friend before he and Shadow sacrifice themselves to move it away from Earth before it explodes. Sonic reconciles with Tails and Knuckles while Tom recovers from his injuries.

During a race with Tails and Knuckles, Sonic accidentally ends up in New York and is ambushed by an army of Metal Sonic robots but is saved by Amy Rose. Elsewhere, Shadow has survived the cannon's destruction.