Sonic Generations — the ultimate celebration of everything fans love about SEGA's iconic hero — just veered dangerously into "uh-oh" territory.

The game's official Japanese site just opened and revealed that alongside Sonic, Tails, Dr Robotnik and Metal Sonic, the so-called ultimate life form Shadow the Hedgehog will make an appearance, along with classic Sonic Adventure 2: Battle stage Radical Highway, which was previously hinted at.

It's not sure in what capacity Shadow will feature, but as long as he's not driving around shooting things, it might not be too bad.