Damn, must have been another tired night. I'm pretty tired now as it happens so I'll avoid saying much...You're thinking of Defenders of Oasis
I've heard quite a bit of praise towards Sonic Chaos, most entirely because of that flying board you get to use... I wasn't really impressed by the gameplay videos I saw, though, but I try not to be swayed by them too much before playing the game.
I'm not much of a fan of Mortal Kombat - I think it is OK, but there's only so long it holds my interest (course, it'd help if I could get a second player to play it; casual gamers don't seem to have much love for Mortal Kombat these days), so I'm not sure I'll be hunting that one down any time soon.
As for the power cable, I think one of those, erm... plugs with multiple ends that can be switched for others should work... - if there's a name for it, it eludes me now; I really am tired - it worked for my Gameboy anyhow.
Anyhow, sleepy times.