MacKenzie "Big Mac" Chalker, better known to his friends and colleagues simply as Mac, is a former health care assistant who worked at Holby City Hospital's emergency department from 2007 until 2016. He was initially a porter upon his arrival in the department in November 2007 but later trained to become a emergency care assistant for extra money in 2013. In 2014, he retrained to become a health care assistant and work back in the ED following Jeff Collier's death. In 2016, he resigned following an incident with some stolen drugs which left him feeling guilty.
Big Mac tries to be everyone's friend and loves nothing more than sharing a few jokes over a nice cup of tea. When things don't go his way he can be overly sensitive, and just a little bit grouchy. He's unlucky in love, but eternally optimistic that this will change. He loves his country and he's very proud of his service in the army.
Previously our well-loved porter, his new role within the team means that he gets a unique insight into the patients’ lives as he assists with their treatment, without the tough responsibilities of a nurse. His laziness can often get him in trouble, but he can always rely on his best friend Noel to bail him out.