'House of the Dragon' stars will always find a way to support each other! 🐉 Fabien Frankel (Ser Criston Cole) got into a full disguise to surprise his former costar Milly Alcock (younger Princess Rhaenyra Targaryen) on the set of 'Supergirl.' "I had a makeup kit. I put on some glasses and did my best makeup artist impression," @fabienfrankel tells EW. #HOTD #HouseoftheDragon #Supergirl