Granpapi Rivera is a friendly old man who loves his grandson Manny very much. And he also happens to be evil to the core. Back in the day, Granpapi was the super-scary supervillain Puma Loco. With his Sombrero of Chaos, no one could catch Puma Loco...no one but his own son, White Pantera, that is. These days Granpapi is retired, or so he says. He'll still pull off the occasional billion dollar heist, but only a few times a day. Granpapi never shies away from mischief, especially if it means spending time with Manny. Who else is going to show him just how much fun it is to be bad?