Just when you thought this series was going to be a one seasoner, ABC goes ahead and does this.

The network has renewed Castle for a second season. ABC hasn't said how many episodes the renewal is for. In fact, they haven't even said officially that the show has been picked up for a second season. We won't find out until this Tuesday, May 19, when the network unveils all of the new shows (and which of the old ones are staying or going away) at their upfront presentation.