The Gems soon meet Uncle Grandpa, but think that he is dangerous; as they prepare to attack Uncle Grandpa, he is able to summon a plot hole from Belly Bag, which transports himself and Steven to Uncle Grandpa's RV.
The Gems soon meet Uncle Grandpa. He is dangerous. This is what the Gems think. He is able to summon a plot hole from Belly Bag. They prepare to attack Uncle Grandpa. Belly Bag transports himself to Uncle Grandpa's RV. Belly Bag transports Steven to Uncle Grandpa's RV.