Wednesday’s TV highlights: ‘Homeland’ marathon and more

Homeland Showtime offers a marathon of this Emmy-winning espionage drama, with an entire season airing each day through Sunday ahead of the show’s Season 6 premiere on Jan. 15. Claire Danes and Mandy Patinkin star. 10 a.m. Showtime Undercover Boss New York & Company chief executive Greg Scott works at one of his retail outlets in this new episode.