Shadow has been confirmed for Sonic Boom, so I decided to make a little comic about Sonic's and Tails' reaction to his appearance (as for the color of the dialogue; Sonic-Blue, Tails-Yellow, Shadow-Red, Amy-Pink, Sonic and Tails-Green); enjoy!
Ask me if you can't read anything (my handwriting can be bad at times) and what Shadow is saying in the second panel is Japanese for "Hey! Guys, look!".