A victory by the team seems 'within the realm of possibility'. [=a victory seems possible]
It's not 'beyond the realm of possibility' [=it's not impossible] that he will return.
new discoveries in the 'realm' of medicine
(..) makes it past the Wall, do we have enough men to fight them? If the Mad King's daughter takes the Iron Throne, she'll destroy the realm as we know it. Some of you are bannermen of House Tyrell. But House Tyrell is in open rebellion against the crown. (..)2017 TvShow: Game of Thrones Title: Stormborn Season: 7 Episode 2
(..) If he dislikes one monarch, he conspires to crown the next one. What kind of a servant is that? The kind the realm needs. Incompetence should not be rewarded with blind loyalty. As long as I have my eyes, I'll use them. I wasn't born (..)2017 TvShow: Game of Thrones Title: Stormborn Season: 7 Episode 2