ELMSFORD, N.Y.--(BUSINESS WIRE)--Party City Holdco Inc. (the “Company" or "Party City") (NYSE:PRTY), the leading vertically integrated party goods company in North America, with Warner Bros. Consumer Products, announces an extended portfolio partnership to develop and market a full range of costumes and costume accessories beginning with Halloween 2016. With The Wizard of Oz, Harry Potter, Scooby-Doo, The Flintstones, and many more Warner Bros. properties, these new and innovative programs will be available exclusively at PartyCity.com, Party City and Halloween City retail locations. Beginning in 2017, Party City will also offer a range of costumes and accessories of DC Comics Super Heroes including Batman, Superman, Wonder Woman, the Justice League and more.