Sonic the Hedgehog 2 (movie)
Sonic is rescued by Miles "Tails" Prower, an anthropomorphic two-tailed fox who idolizes him and comes to warn him about Knuckles. Sonic convinces Tails to help him find the Master Emerald, while Robotnik reunites with his assistant Stone and, scheming to steal the emerald, offers to help Knuckles. Sonic and Tails follow clues to a Siberian cave on a map Longclaw gave Sonic before sending him to Earth, where they find a compass within a temple. Robotnik and Knuckles track them and chase Sonic and Tails down a mountain. Knuckles reveals that he lost his father and his whole tribe the same day Sonic lost Longclaw. Despite this brief moment of sympathy, Knuckles and Robotnik steal the compass, though Knuckles begins to question Robotnik's sense of loyalty and honor when he mocks Sonic for choosing to save a wounded Tails instead of the compass.