Dave doesn't have high hopes for his first day at a new school in a new town called Muddle. But he has no idea just how bad things are going to be. Getting bullied, having his secret crush revealed to the entire class, and then that snot bubble... No, Dave is totally not killing it at Muddle School. But then Dave begins working on a time machine for the science fair and he gets a brilliant idea. What if he goes back in time to redo that first day of school and avoids doing all the dumb and embarrassing stuff he did? Could that turn everything around for him? Could Dave actually become... cool?