When you find yourself trying to remember a show (or any works) that's on the tip of your tongue but just out of reach, come here - the collective brain of the TVTropes community can probably help. Post all the details you can remember (examples help). If you're looking for a trope, head over to Trope Finder. Have general questions about tropes? Visit Ask The Tropers!
SunBad
Since: Sep, 2010

Looking for an old Sci-fi young adult TV show involving a group of people consisting of the main male protagonist, female protagonist, tiny midget pet called "Prism" and an old man mentor-type character. The show followed their adventures collecting weird robot parts either through time, space or both. In the end the old man betrays the group by putting together the robot parts to form some killer robot suit. Male protagonist resets the universe to win, and ends up back in high school or something. In the final scenes, he meets the female protagonist in school, but she doesn't recognize him, and the midget pet is reborn as a literal prism that she wears.
The date range is likely 80-90's, definitely before 1995.