"My character really is like an ex-warrior who's become a peacenik. So I have a group of peaceful; sort of like a cult, peaceful tribe, who have brought back ... I bring back a much-loved character who everybody thinks is dead. So I'll leave it at that," he told BBC Breakfast.
Many believe he was talking about the fate of Jon Snow, who was seen bleeding out in at the end of season five, after being stabbed by his fellow men of the Night's Watch.
Kit Harrington, who plays Snow has been snapped on set, but claimed in a recent interview that he was only there in the capacity of a corpse.
McShane later teased it could be The Hound he brings to life during a chat with Radio 5.
While he did not clarify exactly which character will return to screens fans were not happy about the unsolicited spoilers.
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The actor offered a no nonsense response to those who got their feathers ruffled over the incident.
"You say the slightest thing and the internet goes ape," he told The Telegraph.
"I was accused of giving the plot away, but I just think, 'Get a f***ing life'. It's only tits and dragons."
- nzherald.co.nz