The actor, also known as musician Raleigh Ritchie, posted on his Instagram page photos of him on his first and last days on the Game of Thrones set.
"GoT was like the craziest school trip ever," he wrote. A 6 year Adventure Weekend. Grey Worm. You went from a robot to a real boy. I'm proud of you. I'll miss you bud. Thank you to everybody that cared about him and rooted for him. He was really scared at first, but you made him feel loved. He appreciates it. I asked him."
"Huge shout out to the Targs team: Nats, Emilia, Conleth, Peter, Iain, Ian, Michiel, Reece, Ed, Kit, Liam," he continued. "Thank you for making the days so fun. Here's to every single department behind the scenes that worked to the bone to make this show. They worked tirelessly everyday to make this thing, and they never get shout outs and they know that but they do it anyway. Here's to you, you ragtag bunch of talented clever rascals. I love ya'll. Thank you. Game of Thrones ENDS tonight on @hbo AT 9pm and @skyatlanticuk at 2am. I hope you enjoy it."