Can't keep all the new characters and locations from "Game of Thrones" Season 4 straight? There's a new clip for that. HBO has released a "'Game of Thrones' Season 4: Characters and Locations" feature that covers Meereen, the Dreadfort, the Thenns, Dorne and Oberyn Martell.

WARNING: Full "Game of Thrones" Season 4 spoilers ahead.

The "Game of Thrones" series, despite the many deaths of late, continues to expand its characters and locations. Daenerys has spent most of "Game of Thrones" Season 4 in Meereen, the last slaver city in Slaver's Bay yet to fall under her control, while there have been plenty of new developments at King's Landing and in Westeros. Emilia Clarke and Jacob Anderson (Grey Worm), Iain Glen (Jorah Mormon) and series creators David Benioff and D.B. Weiss discuss the road to Meereen as well as what liberating Meereen meant to Daenerys. The culture of Meereen is something new to the "Game of Thrones" series, notes Weiss, and one the series creators were eager to explore.

While "Game of Thrones" Season 4 does not make its way to Dorne, Oberyn Martell, better known as the Red Viper, makes his way to King's Landing. The Prince of Dorne wants to avenge the death of his sister, Elia, at the hands of the Mountain, and his hatred of the Lannisters is made quite clear in the Season 4 premiere. Benioff calls Oberyn the "ultimate wild card" as his charm, intelligence and quick temper make him a dangerous character. The feature also covers Oberyn's motives, his paramour Elaria and the culture of Dorne. Oberyn is currently part of the Small Council and one of the three judges for Tyrion's Trial and it looks like he will get his chance at revenge in "Game of Thrones" Season 4, episode 8, "The Mountain and the Viper."

Ramsay Snow, the Bastard of Bolton, and Theon/Reek have had a larger role in Season 4, and the Bolton home, Dreadfort, has been heavily featured. Iwan Rheon (Ramsay) has some fun discussing his twisted character while "Song of Ice and Fire" creator George R.R. Martin goes into the history of the Bolton family and their penchant for flaying their victims. Oleanna Redwyn and Margaery Tyrell are already established characters, but the Lord of Highgarden, Mace Tyrell, finally makes his debut in "Game of Thrones" Season 4. Granted Mace is no match for Oleanna, the Queen of Thrones, but it's nice to see his bumbling presence on the show.

"Game of Thrones" Season 4 also expands its cast of characters and locations beyond the Wall. The Thenn, led by Sty, are unlike the other Wildlings groups seen up to this point in the series and are savage killers who just happen to be cannibals. 

The "Game of Thrones" Season 4 "Characters and Locations" clip can be viewed below. The next episode, "Mockingbird," airs on Sunday at 9 p.m. EDT on HBO.