'Station 19': Andy Races Toward Danger in Pulse-Pounding Freshman Finale Sneak Peek

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Station 19 is closing out its first season with an explosive ending.

On Thursday's freshman finale, titled "Not Your Hero," Chief Ripley holds final interviews for the role of captain of the firehouse but is interrupted when the team is called to a massive skyscraper fire, causing several lives to hang in the balance.

In ET's exclusive sneak peek, Andy (Jaina Lee Ortiz), Jack (Grey Damon) and Dean (Okieriete Onaodowan) report to the scene of the fire, but another firefighter from nearby Station 19, Charlotte Dearborn (guest star Jee Young Han), from a nearby firehouse is a little too gung-ho about battling the flames, even after being warned by the Station 19 crew that the risks may not be worth it.

"Go big or go home, right?" Dearborn asks before racing straight into the fire, after noticing a break in the blaze.

While Andy and company aren't willing to run toward the danger without as fool-proof of a plan they can concoct, Andy begins to worry about Dearborn's safety after the young lieutenant fails to respond.

"Dearborn, confirm you're OK!" Andy frantically yells into her radio. "She might be hurt. I gotta go in!"

"Andy, it's too much. You can't make it," Jack warns, as the flames seem to grow bigger and bigger.

"The hell I can't," Andy says to herself before she races toward the fire. 

Station 19 wraps its first season on Thursday at 9 p.m. ET/PT on ABC.

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Copyright (c) 2018 CBS Studios Inc. All Rights Reserved.