Sonic the Hedgehog 2 has been fairly vague with its story details so far, but the reveal that fan-favorite character Knuckles the Echidna will be playing a major role means that the film could be setting up another popular group from the series: the Chao. The Sonic games are surprisingly packed with lore, meaning that carrying over only a few of the games' elements to the movies could have major implications. The trailer hints that Dr. Robotnik's plan this time around will greatly expand the world of Sonic the Hedgehog, adding more characters and possibly an even greater villain.
Sonic the Hedgehog (both the movie and the games) follows the blue blur as he attempts to save his friends and his world from the villainous Dr. Robotnik, who is given the demeaning nickname Dr. Eggman by Sonic. The trailer for the much-anticipated sequel Sonic the Hedgehog 2 hasn't explained much, but it has shown that Dr. Robotnik has somehow obtained the power of the Master Emerald as well as the companionship of Knuckles the Echidna, a red powerhouse whose ego is the only thing bigger than his fists. In the games, Knuckles is a member of the Echidna tribe who is tasked with guarding the Master Emerald, a mystical gem that grants its wielder immense power. Although the movie's setup seems to be fairly simple, it is entirely possible that a wealth of interweaving elements from the games could find their way into Sonic the Hedgehog 2.
Related: Why Sonic The Hedgehog 2 Can Outrun The Original
The savage Echidna Tribe appeared in the first Sonic film, attacking Sonic and Longclaw the Owl near the beginning of the film. Although they were barely featured, the introduction of Knuckles and the Master Emerald means that the sequel will probably
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