Simplify the following text for a Grade 5 native English-speaking person.
Original: Four feature-length movie versions of the `` Get Smart '' idea have been produced : first , with part of the original cast in 1980 's The Nude Bomb , which was also called The Return Of Maxwell Smart , then in the 1989 ABC TV Movie Get Smart , Again !
Simplified: In 1980 , a movie The Nude Bomb was released in theaters . In 1989 , a television movie was shown called , Get Smart , Again ! .