A stray sock and a clogged toilet lead to a biohazard situation that forces the bus to stop.

Ruby tells Otis she loves him, but Otis—ever the honest therapist—cannot say it back yet.

They finally address the deleted voicemail from Season 2.

Poor Rahim is at the center of the mess, leading to a rare moment of vulnerability for the usually poised character.

Students are publicly shamed for personalizing their uniforms.