Jon Snow's (Harington) fate has been up in the air since Season 5 concluded with him being stabbed by the Night's Watch. Fan sightings of the actor in Belfast, Ireland, where the show is filmed, and posters of the new season have amped up the anticipation that Snow may have survived the attack.
Dormer actively avoids Game of Thrones spoilers by only reading her own story lines in the scripts, but the actress revealed to Jimmy Kimmel that she often finds out show secrets in the makeup trailer.
"I stopped reading other people's story lines. I only read the scripts relevant to Margaery," she said. "It's annoying sometimes because I'll be in the hair-and-makeup trailer and someone will show up and I'll be like, "What are you doing here? Oh my God, you're back?! I've got to leave.'"
Combine that with Dormer admitting that she split her time filming Season 6 between Belfast and Spain and it seems likely that Harington was her early-morning surprise.
Game of Thrones Season 6 has wrapped production, but HBO has not announced the exact premiere date.