Currently you are able to watch "Sonic the Hedgehog 2" streaming on HBO Go. It is also possible to buy "Sonic the Hedgehog 2" on Google Play Movies, Apple TVas download or rent it on Apple TV, Google Play Moviesonline.
After settling in Green Hills, Sonic is eager to prove he has what it takes to be a true hero. His test comes when Dr. Robotnik returns, this time with a new partner, Knuckles, in search for an emerald that has the power to destroy civilizations. Sonic teams up with his own sidekick, Tails, and together they embark on a globe-trotting journey to find the emerald before it falls into the wrong hands.