Robin Hood, Time Traveler

It is the year 2167 and twelve-year-old genius Robin Hood has invented time traveling technology, but his bosses only want to use it to monitor the timeline and make sure everything stays the same; but Robin wants to help people (and luckless dinosaurs) and so he uses his device to travel back in time, picking up some other do-gooders along the way, and pursued by his heartless boss, Mr. Prince.