Playtime is over when the boys enter fourth grade. Missing the carefree days of third grade, they come up with a daring and scientifically complicated plan to travel back in time a full year, with the help of Timmy and his electronic wheelchair. Meanwhile, their new teacher, Mrs. Choksondik, seeks advice on how to handle her class from their old teacher. She finds Mr. Garrison living in a cave facing down his own demons.
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