* GAME OF THRONES. 9 p.m. Sunday, HBO.
No longer just one of the most-watched shows on premium cable, "Thrones" this season has become one of the most-watched TV shows on Sunday, period. This week's episode, "The Bear and the Maiden Fair," was written by George R.R. Martin, on whose books the series is based.
* ULTIMATE SURVIVAL ALASKA. 10 p.m. Sunday, NatGeoTV. Moves to 9 p.m. starting May 19.
Can't get enough of Alaska shows? This one takes eight experts in extreme survival - ranging in age from 26 to 57 - on an expedition where the goal, according to the network, " is to make it out alive, using just the gear they can carry in their packs.
* FAMILY TREE. 10:30 p.m. Sunday, HBO.
Fans of Christopher Guest ("Best in Show," "Waiting for Guffman") should welcome the chance to see his latest venture, a semi-improvisational comedy about a slightly lost man named Tom Chadwick (Chris O'Dowd, "Girls") who embarks on a search for his roots after a relative leaves him a trunk full of mementos.