Warning! Spoilers ahead for Sonic the Hedgehog 2.
Sonic the Hedgehog2 features a rather hilarious MCU reference during the titular Blue Blur's battle with Knuckles the Echidna (Idris Elba). However, the film neglects to think about the future by not saving the joke. By the film's end, Sonic 2 sees Knuckles and Sonic becoming friends along with Tails the Two-Tailed Fox, uniting in the face of new threats being teased on the horizon. As such, an imminent foe coming to the live-actionSonic universe would have been much more deserving of Sonic's MCU gag than Knuckles.
In Sonic 2, the Blue Blur and his new friend Tails have been led to Siberia following a message from Longclaw the Owl who confirmed that the Master Emerald was hidden on Earth. Finding a compass to lead them to the temple housing the powerful object, Jim Carrey's Doctor Robotnik and Knuckles intercepted them, resulting in an intense snowboard chase with the red echidna warrior in hot pursuit of the blue hedgehog. Exasperated that Knuckles was still following him, Sonic sarcastically groans: "Oh great, it's the Winter Soldier", a reference to the MCU's Bucky Barnes and his time as a brainwashed and deadly agent of HYDRA.
Related: Sonic 2 Takes A Shot At Almost All MCU & DCEU Superheroes
While there are some similarities between Knuckles and the Winter Soldier such as their inadvertent time on the dark side (Robotnik tricked Knuckles into being his ally by masking his true intentions), the MCU reference is ultimately wasted on the echidna. This is largely due to Sonic 2's post-credits scene teasing Project Shadow and the dark hedgehog of the same name. Shadow the Hedgehog is a classic Sonic rival created by Robotnik's grandfather in his attempt to create the
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