'Game of Thrones'
'Game of Thrones'

A brand new, death-tinged trailer has arrived for season four of "Game of Thrones," which saw (SPOILERS) virtually most of its principal cast get slaughtered toward the end of season three. Also, geek out over a new 15-minute behind-the-scenes featurette for the series, which reboots on HBO April 7.

HBO is currently kicking ass with the knockout slate of original series "Girls," "Looking" and "True Detective." Come April, Sunday will have big shoes to fill, so hopes for primetime Emmy-winning juggernaut "Thrones" are high.