Click here to see the cover.

And here we are, the link above to the cover, and below, the plot, as describes by Worlds of Westfield.

Enemy Mine. A trip to Robotropolis to rescue the roboticized Overlanders baffles Sonic and Bunnie, as many of the Overlanders haven't even been roboticized.

There you go. Enjoy, folks.

Credit: Worlds of Westfield