Jayextee, on Nov 11 2008, 02:51 PM, said:
Nack would be good. In any case, I would suggest a new character acting as a secondary villain, for the reason outlined by Matwek.
I did have an idea for a story that covered a fair few of the debates that have been raging over who should be the new character, should there be a different metal sonic and should the final boss take place in space or underground for a change.
Quick and simple like most of the old sonic stories.
Robotnick employs Nack to help him steal the master emerald in return for his own Metal sonic bodyguards.
Sonic, Knuckles and Tails follow them.
Near the end the game splits with sonic going after Robotnik in space, Knuckes following Nack as he escapes in a Sub and Tails goes back for the Bi-Plane.
That leaves things open for some quite cool concepts. We had a particularly good idea of the master emerald being turned into a bomb to be fired from space and super sonic racing after it to stop it before it hits (pictures on the old forum).
Kuckles story could end with him fighting Nacks new sonic bodyguards all at once, which allows for several new metal sonic designs, and I always wondered what tails got up too when he went back for the plane, could have a few extra bosses there.