When floodwaters threaten to destroy Arlen, Hank opens the floodgates to a dam; meanwhile, Bill becomes the leader of a group who've taken shelter in the high school gym.
Cotton plays detective when someone begins drinking Hank's grapefruit juice; Dale tries to launch his own home security company.
...and Love the Alamo: Hank reacts with disbelief when he realizes Bobby's history textbook contains almost nothing on the Alamo; Peggy photographs a Flat Stanley doll to help teach kids about geography-and safety issues.
Luanne joins forces with Hank to protest a propane ban at the Texas State Fairground grill-off; Peggy goes to extreme lengths to gain access to a laundry room where an infamous murder took place.
Bobby joins the school's academic team, where he specializes in pop culture, but the stress proves too much for him to handle.
