Sheela and Gale are minions of Don Kee. They are often partnered with each other as Don Kee's police department. Both of them managed to steal Goku, Trunks, and Pan's Ship to keep them from leaving the Planet. When the three went to retrieve they ship back, Sheela and Gale appeared to fight them. However, the duo were easily defeated.
When Goku, Pan, and Trunks wanted to end Don Kee's rule, they "turned" themselves in and Sheela and Gale were the ones who brougth them to Don Kee. When they reached Don Kee's palace, Goku, Pan and Trunks busted out and easily defeat the duo again.
Like nearly every villain in the Dragonball Series, both Gale and Sheela can fly and generate Ki Blasts.