NEW YORK, March 12 (Reuters) - SeaWorld Parks &

Entertainment was sued on Thursday by the nonprofit Sesame

Workshop over its alleged refusal to honor its contractual

obligations as the licensee of the "Sesame Street" brand.

According to a complaint filed in Manhattan federal court,

SeaWorld, a unit of United Parks & Resorts ( PRKS ), has "run

roughshod" over the licensing agreement, refusing to pay

royalties and posing an "imminent threat" to Sesame Workshop's

brand.