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
(..) Tea? - I don't drink tea. - What do you drink? Not tea. So, I keep a watchlist of individuals and beings from other realms that may be a threat to this world. Your adopted brother, Loki, is one of those beings. - A worthy inclusion. - Yeah. (..)2016 Doctor Strange