Radiator Drain Plug

So here's the problem I currently have. The part of the radiator drain plug that allows you to tighten or loosen it has broken off. There is still part of the plug in the radiator which is a good thing. What I'd like are any ideas on how I can go about removing this so that I can install a new one. Please help me. Thanks.

An EZ-Out (screw extractor) might work.

A dremel style tool with the right bit can cut a slot so you can use a screwdriver to remove the plug.

As long as it does not leak, leave it. Use the lower rad hose to drain.

Thanks for the help. Used a drill bit to make the initial hole and then a screw extractor to remove the remainder of the plug. Just wish the weather had been better and it would have made for a perfect night.