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When Gemma decides to fire a teacher at her school, she's unprepared for the aftermath; Calvin gets a surprise when he faces off with his newspaper carrier.

Tina agrees to give Grover piano lessons; Malcolm lands a job in retail sales; neither has a first day that goes quite according to plan.

At college, Sheldon decides to expand his responsibilities and become a dorm resident adviser; Meemaw and Dale make a sketchy business deal; Mary and George Sr. rekindle their romance.

Sheldon discovers that Mary's been keeping a secret about him; Meemaw is furious when she learns Dale fired Georgie.

Players from rival cities try to hit the best bonus squares for a chance to take home the $10,000 prize.

A former high school Quiz Bowl coach sees if he can ace the test.

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The team tries to find a bike messenger -- who has kept a video diary of his troubles with women -- before he can commit another violent act; the new deputy chief calls Benson's leadership into question.

News of a mass shooting brings the members of Firehouse 51 into harrowing territory; Casey investigates the missing money from the fundraiser; Jimmy participates in a boxing match; Chili's erratic behavior continues to be a major issue for Brett.