From the Guys that Brought You My Little Pony: the Movie. an island where they encounter an ancient tomb with carvings of Sonic and Tails on the entrance. Sonic is stopped twice by Amy from opening the door, but when Metal Sonic ambushes the group, Sonic opens the door and the group escape. Inside, they encounter an imprisoned, but powerful snake villain named “Cliff the Last Ancient”. Cliff recognizes Sonic from events transpiring one thousand years ago and captures the group, but Tails deactivates the shackles and turns them into beams named Enerbeams for the group to use.
After meeting Larry and Tonic, the group discovers that Cliff planned to power an army of war robots with the “Chaos Crystals” to create a world of twisted metal and robots, but both Larry and Tonic were imprisoned by their peers among the Ancients when they discovered the plan; the group then set out to retrieve the Chaos Crystals before Lyric.
At an abandoned research facility, they meet MAIA, a robot who rebelled against Lyric, who assists them by creating a time portal, allowing Sonic and Tails to go one thousand years back in time to retrieve a map showing the location of the Chaos Crystals. Sonic and Tails are then attacked by Shadow, but defeat him, enter the portal, successfully retrieve the map from inside Cliff's weapon facility and trap him inside for future imprisonment by the Ancients.
Cliff reluctantly forms an alliance with Eggman, but after no success, Lyric turns on Eggman by programming Metal Sonic against him as well as Shadow's return. The group defeat Metal Sonic and Eggman and retrieve the final Chaos Crystal, but Sonic is then surrounded by Lyric and his robots. Cliff demands the Crystals; Sonic refuses to give them up, but Tails, Knuckles, Amy and Sticks agree to do so. Sonic is then attacked by Cliffs robots and buried under rubble, but recovers and the group set out to Cliff's Lair to stop him.
During the battle, Cliff, along with Tonic and Larry betrays Sonic and the gang, reprograms the Enerbeams to ensnare the group, but before he can take advantage of the situation, Shadow ambushes Cliff from behind, freeing the group. Tonic and Larry reveals that Cliff is their best friend. Sonic then ties up Cliff, Tonic and Larry, with assistance from his friends and removes Cliff's technopathy device to incapacitate him; Knuckles discards it. The group celebrate, but in a post-credits scene, Eggman recovers the device and uses it to revive Metal Sonic. MMPA Rated PG for Mild Action Violence
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