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The character's supporting cast, powers, and trappings have slowly expanded throughout the years. Superman's backstory was altered to allow for adventures as Superboy, and other survivors of Krypton were created, including Supergirl and Krypto the Superdog. In addition, Superman has been licensed and adapted into a variety of media, from radio to television and film. The motion picture Superman Returns was released in 2006, with a performance at the international box office which exceeded expectations.[7] In the seven decades since Superman's debut, the character has been revamped and updated several times.