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History

Better Call Saul

Season 3

Dr., M.D., is the head doctor hired by Gus as part of an emergency medical crew he had stationed in Mexico

Barry meets with Mike after receiving a call in advance from Gus. He supplies Mike with cocaine. ("Sunk Costs")

Season 4

Barry and Victor examine Hector, unconscious in his hospital room. Later, Barry reports Hector's condition to Gus and offhandedly suggests medical care from Johns Hopkins. ("Breathe")

Season 5

Barry is tasked by Gus to pick up Mike who passed out after getting beaten up and stabbed by a group of thugs. He takes him to Mexico and tends to his wounds. Mike tries to leave immediately after waking up but Barry finds him and advises him to stay until he's all healed up as he would "not survive the journey" back home in his current state. ("Dedicado a Max")

Breaking Bad

Season 4

Barry and his team treat Gus for poisoning and Mike for gunshot wounds after they led an attack on Don Eladio and the Juárez Cartel. He initially ignores Mike and goes straight to helping Gus, because Gus "pays his salary". It is known that he has blood samples and knows the complete medical history of Gus, Mike, Jesse, and most likely others. ("Crawl Space")

Season 5

About a week after the events in "Face Off", Barry informs Mike that Gus has been killed. ("Live Free or Die")

Trivia

Barry is one of the survivors of Gus' network, likely because Walter and Lydia never crossed paths with him.

Barry shares the same surname as Saul Goodman. However, they are not related, since Saul Goodman is actually Jimmy McGill's professional name.