Ernest had a girlfriend named Eunice, of whom he was very protective, often picking fights with anyone who so much as looked at her.
On October 12, he was standing at the entrance of Hill Valley High School, to make sure that no unauthorized individuals entered the Hill Valley Science Exposition. He told Citizen Brown to leave the Delorean at the school's entrance thinking it was a future car exhibit. When Marty offered him an algae cake, he found tasted bad.
The next day, it was revealed that Ernest was the one who made the algae cakes when he was handing out free samples at the Hill Valley Expo. Upon recognizing Marty, he refused to give him a sample due to the incident at El Kid. He was the second person on the roster for a presentation (between Lev Grossman and the occupied Danny Parker).
- During his speech at the Expo, Ernest requests that you come and see him at his booth. More specifically, booth "A113". The number A113 is a running gag in Pixar films, and has an Easter egg appearance in every one of them.
- Back to the Future: The Game
- Back to the Future: The Game - Episode 2: Get Tannen! (First appearance)
- Back to the Future: The Game - Episode 4: Double Visions
- Back to the Future: The Game - Episode 5: OUTATIME (First identified as Ernest Philpott)