Frank is a bat that invaded Hank's garage in the episode "It Came From the Garage". Bobby gave the name to the bat, as he and Frank "were practically roommates." Bobby told Joseph, who told his mother, who told her husband, who told everybody. Dale, Bill, and Boomhauer decided to help Hank get over his fear of bats by chaining him between trees that were near Bat Bridge, home to 20,000 of Arlen's bat population. Bobby's boat was sinking, and as soon as he was unchained, Hank came to Bobby's rescue, and they stopped the boat from sinking. Frank was last seen flying in a circle in the air, causing Hank to shudder.