In our regular TV roundup, we review the week on the small screen. We start today with the sitcom How I Met Your Mother, which finally delivered on the promise of its title last night after more than 200 episodes. We also discuss the season four finale of The Walking Dead, which drew a staggering 15.7 million viewers. And season four of HBO’s Game of Thrones premieres Sunday. We talk about the show’s penchant for killing off major characters.