Fox ’s midseason series Best Medicine is based on the beloved British show Doc Martin . The show’s latest casting will make the connection even more concrete.

Martin Clunes, who played the title character on Doc Martin , has signed on for a guest role in Best Medicine — though not as the British doctor he played for 10 seasons spanning almost 20 years. Instead, Clunes will play Dr. Robert Best, the father of lead character Dr. Martin Best ( Josh Charles ).

Robert is an accomplished but headstrong gastroenterologist whose demeanor makes Martin’s prickly bedside manner seem warm by comparison. He arrives in the New England town where Martin has moved after giving up his surgical career in Boston and puts everyone on edge, including his estranged sister and Martin’s aunt (Annie

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