Zazzo
An imp from another dimension, Zazzo invented a helmet which stole Captain Marvel's lightning with a rod on top, and gained his powers though with a reversed colours costume like the Reverse-Flash, taking the name Zazzo-Plus. He tricks Cap into turning back, then puts a muffle mask on him to stop him transforming. Billy, with the help of Freddy, turns Zazzo back, becomes Captain Marvel using the helmet, and spanks Zazoo, before Zazzo the Elder takes Zazzo the younger back to his own dimension.
Read more about this topic: List Of Marvel Family Enemies