a crazy magic user kidnaps red robin and offers him as sacrifice to the ghost king, proclaiming that his death will seal a binding contract that will make her the ghost queen, which will force the king to do her bidding.
danny, seventeen and still the ghost prince since he's too young to take the throne, looks at the crazy middle aged lady who's talking nonsense and purposefully misunderstands her. he points at red robin and says, "so that's my fiancé? sweet. he's cute too." then takes advantage of her outrage to knock her out. he proceeds to untie red robin when the circle starts to glow.
unfortunately for danny, the summoning circle took his words as him rewording the contract and accepting red robin as his bride. the rest of the batfam appear just in time to see fright knight come out of a portal and present the consort's betrothal ring to a really confused red robin.