Sesame Workshop is suing SeaWorld, accusing the theme park operator of withholding royalties and undermining the 'Sesame Street' brand.

In one of the wilder corporate lawsuits we’ve seen in a while, Sesame Street is suing SeaWorld’s parent company after a 45-year partnership between the two family-friendly companies turned ugly.

According to the complaint, matters worsened in September when SeaWorld stopped paying royalties to Sesame Workshop altogether.

A legal battle over the beloved Sesame Street brand has landed SeaWorld in federal court, according to documents obtained by ...