Will we ever see Benjen Stark again?
I don't know if you want spoilers or not, but if you don't mind, here's the relevant part (to your question) from the link in Captaindemotion's post above:
Personally, I think it's more likely that:Most interestingly, Episode 8 lists Joseph Mawle as making an appearance. If you cast your memory back—waaaay back, to the pilot episode—that was the actor who played Eddard’s younger brother Benjen Stark. Benjen was influential in getting Jon to join the Night’s Watch, but once Jon arrived, he went out ranging and never returned. Book Readers suspect he is the (so far cut) character Coldhands, a White Walker-esque character who helps Sam and Gilly in their hour of need, as well as guiding Bran Stark and company to the giant weirwood tree. If the show was to finally bring in the character Coldhands, or bring back Benjen Stark as a White Walker, this huge battle with the army of the dead would be the perfect time to do so, and to have Jon recognize him.
He's been captured by the Wildlings or is working with them against the White Walker threat.
It would have been great if he had shown up right after I asked about him, but I didn't see him in the episode. Was the actor playing one of the white walkers?
The battle scenes were nice but a little confusing.