Diane (Traci Thoms) returns to help with Crisis One intervention training for Station 19 and Station 23 firefighters.

Meanwhile, Andy and Sullivan continue to be at odds, and Jack helps a young autistic man on a city bus.

Guest starring is Traci Thoms as Diane.

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STATION 19 - “100% or Nothing” – Diane (Traci Thoms) returns to help with Crisis One intervention training for Station 19 and Station 23 firefighters. Meanwhile, Andy and Sullivan continue to be at odds, and Jack helps a young autistic man on a city bus on a new episode of “Station 19,” THURSDAY, OCT. 21 (8:00-9:00 p.m. EDT), on ABC. (ABC/Eric McCandless)JAINA LEE ORTIZ