The Robotnik Express
On the way to stop a train of explosives from arriving at Robotnik's munition factory, Sonic and Tails must deal with a duo of bears named Big Griz and Mad Mike after Scratch and Grounder tell them that Sonic and Tails are the enemies.
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More from this season
S1 E1
Best Hedgehog
Sonic frees a prisoner who has been locked at Robotnik's Fortress for 30 years who wants to find his long lost girlfriend which Robotnik also loves.
S1 E2
Tails' New Home
Robotnik creates a robot fox family when he finds out that Sonic is trying to find Tails a new home to keep him safe.
S1 E3
Birth of a Salesman
Robotnik buys new gadgets from an enterprising salesman to help Scratch and Grounder catch Sonic, but winds up regretting his purchases when they keep backfiring.
S1 E4
Submerged Sonic
Robotnik is after the Power Gems from the city of Submerbia and Sonic and Tails are hired to stop him.