The Rorcheck family finds themselves at odds with fellow firefighters when they befriend a crippled former colleague. The problem is he blames Ted that injured him.

A pyromaniac arsonist is committing a series of firebombings with the crew of LAFD Station 1, especially Firefighter Haley Green, singled out in threatening letters.

An old mining site that has filled up with toxic waste is hidden from view. When it suddenly collapses Joe, Haley and Danny are trapped and their lives in danger. The crew struggles to rescue them.