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
(..) Daenerys Stormborn. Haven't heard anything. Shall we begin? A Targaryen cannot be trusted. The Mad King's daughter will destroy the realm. We have an army of fleets and three dragons. We should hit King's Landing now. (..)2017 TvShow: Game of Thrones Title: Dragonstone Season: 7 Episode 1