Author George R.R. Martin has commented on whether or not he will have a cameo in the upcoming Game of Thrones prequel TV series, House of the Dragon. Speaking at San Diego Comic-Con recently, Martin said he will not appear in the show until he finishes the next book, The Winds of Winter, and even then, he might not.

"You may not know this but there's this book I's writing and it's a little late," he said (via IGN). "So I won't be doing any acting until I finish and deliver that book, and if the show is still running then, then maybe."

House of the Dragon has only been picked up for one season, and presumably all the episodes are done and ready, so Martin wouldn't show up in a cameo until Season 2 at the soonest (if the show gets renewed).