Alistair's time machine

Marilyn Sadler is a children's writer. She was born November 17, 1950, in Pittsburgh, Pennsylvania. One of her best known works was made into a television Disney movie, under the title Zenon: Girl of the 21st Century. That book is about a space girl who is sent to Earth and the cultural clashes she finds in her new planet. Subsequently, two additional Zenon films were made, Zenon: The Zequel and Zenon: Z3.