Halloween Costume Failure

I am nearly finished constructing our son's robot costume for Halloween and it is apparent he wants nothuing to do with it. Sensing imminent danger from not having a costume in time for parties or trick or treating, I asked my son what he wanted to be for Halloween. Sitting at the kitchen table, we had the following exchange:

Me: What do you want to be for Halloween?
Son: I want to be the red one.
Me: (Not knowing at all what he is talking about) OK, you can be the red one.
Son: I don't want to be the red one.
Me: (Sigh)

And so here I am with clear direction on what to choose as I rummage through the remnants of the local Target store's Halloween merchandise. If he's lucky he'll get a pair of Scooby Doo pants and a Hello Kitty mask. All he needs is a chainsaw and it might be pretty cool.