Firefighter Owen Strand leaves New York to move to Austin, Texas, with his son to help rebuild a firehouse after a tragedy.

The crew faces a mercury poisoning outbreak and a wave pool disaster; Owen must come to terms with his illness; Michelle follows a new lead on her missing sister; TK is unsure how to handle his budding relationship with Carlos.

A massive tornado sweeps through Austin, as Owen, Michelle and their teams race to save those in its path.

Owen and the crew race to a brawl at a male strip club, a fire at a bull semen factory and a protest where male toxicity is taken to a new level; Paul tentatively goes out on a first date; Grace tries to reconnect with Judd.