in 2001 Shadow was genetically engineered to be cool. The reason why he is only 8 years old is due to hedgehog years. Shadow weilds guns to be extra cool. He also drives a motercycle due to stunt class.
Encounter with doctor Robotnik.
The Eggman family had a renunion destroying Mobius and making Pingas city. Shadow threw a Krabby Patty at them causing an explosion. Shadow realized he was late to stunt class and had to go leaving Sonic Tails and Knuckles to do the work.
in 2011 Screwattack made a video called Vegeta vs Shadow.
▶ 9:09www.youtube.com/watch?v=KV47Il1o-Yo* May 9, 2011 - Uploaded by ScrewAttack!Episode 12 - Dragon Ball Z VS Sonic the Hedgehog's rival! Which super- powered anti-hero will dominate ... Shadow got vaporized by Vegeta's final flash at the age of 8.
even though Shadow is dead Silver took his place as the new Shadow.