Warning: Contains SPOILERS for Sonic the Hedgehog 2!
Sonic the Hedgehog 2 sets up not only Shadow the Hedgehog, but the Guardian Units of Nations (GUN) as well, an organization that plays a major role in Shadow's tragic backstory. When GUN is mentioned at the end of the film, it seems like a throwaway reference, but upon further inspection, it is likely that GUN will play a huge part in Sonic the Hedgehog 3. So, while Shadow is already a huge tease in Sonic 2, the film might've shown its hand with GUN, hinting at key elements of the plot of Sonic 3.
Sonic 2's post-credits scene shows two members of GUN talking about mysterious coordinates they have found that lead to an abandoned science project from 50 years ago. It is soon revealed that this was none other than Project Shadow, the experiment that lead to the creation of the ultimate life form, Shadow the Hedgehog. Shadow is a popular antihero from the Sonic game series, having a surprisingly dark and fleshed-out backstory.
Related: Who Is Sonic The Hedgehog's Father? Why He Calls Tom «Dad»
In the games, Shadow the Hedgehog was created by Professor Gerald Robotnik, the grandfather of Dr. Eggman. Robotnik started Project Shadow in an attempt to discover immortality so that he could save his granddaughter Maria who had a terminal illness. Although the cure didn't work, it produced Shadow, who became close friends with Maria while the two were confined on the space station where the experiment took place. Later, GUN raided the site in an attempt to shut down the project, and Shadow the Hedgehog's powers weren't enough to stop them. Maria successfully helped Shadow escape, but in the process, she was shot and killed by GUN soldiers. The death of Shadow's young friend had a
Read more on screenrant.com