Scary Olderson was the teacher in Scary Terry's scary class in high school. He was known to mock students who couldn't answer his questions.
Scary Olderson was Scary Terry's teacher when he went to high school. His mean demeanor and mocking of students left a lasting impression on Terry, who would go on to have nightmares about him even after leaving high school.
He appeared in some of adult Terry's nightmares, which caused him much agitation. In one dream, he was berating Terry for not coming up with a pun involving pumpkins, in a scenario where a victim is chased through a pumpkin patch. Rick and Morty, who had invaded Terry's dream, stood up against the teacher and told him off. Scary Olderson felt insulted and walked out of the classroom, giving victory to the two humans. He was later replaced by Scary Glenn as teacher of scary class.