The newest addition to Michael Schur’s legacy of sitcoms arrived on Netflix Nov. 21. “A Man on the Inside” stars Ted Danson as Charles, a retired professor and recent widower, who accepts an offer from a private investigation firm to work undercover in a retirement home. The first season follows Charles as he figures out how to be a 70-year-old spy and step out of his lonely shell, finding companionship alongside the other residents at the home.