Chlorine gas is used in an attack on the town, leaving Tiffy to save herself and her students, Mack and Bob to secure the apartments and Charles stranded on the road, while Sam and Jonas desperately try to locate the source before all the oxygen is gone. Written by
Did You Know?
Jonas is jogging and finds the dead birds, and then the dead joggers. Realizing that there must be poison gas, he quickly takes his water bottle and douses his handkerchief to use as a mask, and then drops the water bottle. We see him running back the way he came, but there is no water bottle. See more
Walk the Fire
Written by Robert Duncan
This is used as the theme in seasons 3 and 4. See more