Episodes could follow any number of formats. Training episodes would often follow a format of binary oppositions in which the savvy learner Scratch would follow Bleep's instructions while the hotshot Squeak blew off his duties and got himself into trouble. Travelogues featured the trio visiting areas such as the Belgian Congo or New Orleans, with no substantial conflict. Most commonly, the trio would be pit against intergalactic villains, some of whom were recurring: the hooded archvillain Dr. Destructo, who escaped from the rings of Saturn early in the series; Bruto the Black Robot, Dr. Destructo's henchman; Black Patch, a space pirate; and the Black Knight of Pluto.