In the show, we've only gotten a glimpse of Benjen three times: once in the first season, again in season six's second episode, and in season six's sixth episode. In season one, we briefly meet Benjen when he becomes a First Ranger and convinces Jon to join the Night's Watch. He goes on an ill-fated trip ranging north of the Wall with two others, Othor and Jafer Flowers, but never returns. Only his horse and the dead bodies of Othor and Jafer are found (which later turn into wights), so Benjen is widely assumed to be dead. Although there have been a few deaths that have gone down off screen (ex: Brienne executing Stannis), the show never actually delivers his body, so his fate was still up for grabs. Of course, now we know he has survived.
Five seasons later, Benjen appears as a little boy when Bran and the Three Eyed Raven flash back to the earlier days of Winterfell. Ned teaches Benjen how to fight, and it's adorable and heartbreaking, and a hint that Benjen's story isn't finished yet.
