The red-hot third season of the show. Though many of the firefighters still grieve over the loss of one of their own in a brutal explosion, they are faced with new challenges: a determined arsonist, the complications of staff romance and tension inside the house with shocking results. Watch the passion and conflicts flare amongst the brve men and women of Firehouse 51 in Season Three, presented back-to-back and uninterrupted for maximum impact.