Brock Cantillo
Vital statistics
Portrayed By	Ian Posada
Age	6
Status	Alive
Episode Count	6
First Appearance	"Abiquiu"
Last Seen	"Hazard Pay"
Images of Brock Cantillo

Brock Cantillo is Andrea's son and Tomás' nephew.

Andrea rushed him to the hospital after he suddenly became ill by some unknown cause. Jesse Pinkman believes he's been poisoned with the ricin that he had concealed among his cigarettes, which was originally intended for Gus Fring. Walt leads Jesse to think that Gus poisoned Brock, thus giving Jesse a motive to murder Gus. ("End Times")

In the final episode of season 4, it is strongly implied that Walt actually poisoned Brock using the poisonous berries from the Lily of the Valley plants in his back garden ("Face Off"). The final scene of season four pans in on a potted plant labeled Lily of the Valley in Walter White's back pool.

Brock fully recovered from the poison and in season 5 doesn't seem to recognize Walt at Jesse's house when they had dinner. Instead, he was more interested in his Playstation ("Hazard Pay"). Jesse was initially worried about the missing ricin cigarette being out in the open for someone to find and get sick from (like "a child," Jesse suggests), so Walt makes a fake one and plants it in Jesse's house for him to find later, relieving his concerns ("Madrigal").