Since the beginning of A.P. Bio, Jack Griffin has made one thing abundantly clear to his students: he will not teach them any biology at all. That alone would make him one of the worst teachers in the history of Whitlock High School. However, during Season 1, Jack revealed one little fact that proved this entire situation was much worse than anyone could have possibly imagined.

After being put on a forced year-long sabbatical from his philosophy professor position at Harvard, Jack returned to Toledo to live in his dead mother's apartment and work at his old high school. He was quickly hired to teach Advanced Placement Biology to a group of the smartest students in the school. Unfortunately for them, Jack had other plans.

RELATED: A.P. Bio Season 4: Glenn Howerton & Patton Oswalt Reflect on Love & Loyalty

Jack even went so far as to confiscate his students' textbooks to prevent them from learning anything. Instead, he agreed to give them all good grades if they helped him gain revenge on his best frenemy Miles Leonard and didn't rat him out. That didn't stop Sarika Sarkar from trying to get rid of Jack, though.

Jack and the kids at an assembly

Sarika is a driven student, to say the least. She went along with Jack because she didn't want a failing grade. At the same time, she also wanted Jack gone. In Season 1, Episode 11, she took another shot by taking advantage of the Superintendent being in class during a pig dissection. Sarika subtly challenged Jack to show how little he knew about biology in front of someone who would be more than happy to fire him on the spot.

RELATED: A.P. Bio's Teacher Trio Stirs Up Trouble for Season 4

Instead, Jack busted out his impressive biology chops. He then revealed to Sarika and Sarika alone that he wasn't teaching them biology because he didn't want to, not because he didn't know anything about the subject. This was, without question, infinitely worse than not knowing any biology at all. That being said, it at least explained how a philosophy professor got a job teaching high school biology in the first place.

If Jack was working a job he wasn't qualified for and essentially bribing the kids with grades to keep things quiet, it would be almost forgivable -- still awful but at least somewhat easier to understand. But the fact that he is capable of giving these students a legitimate education in biology and chooses not to is truly horrifying. Jack could easily be teaching this class correctly. Instead, he continues to choose not to.

This at least made a modicum of sense in the first season when he needed the kids' help to get revenge on Miles. But his life was destroyed, and fans haven't seen Miles since Season 1's finale. Three seasons later, Jack is still not teaching these kids any biology despite Miles being gone. At this point, he's just not teaching them out of spite, despite the fact that they help him with whatever nonsense crosses his mind.

KEEP READING: A.P. Bio Creator Mike O'Brien Discusses Jack's Future & Heather's Love of Chaos