Stanley Weber as Le Comte St. Germain
Rosie Day as Mary Hawkins
Lionel Lingelser as Louis XV
Claire Sermonne as Louise de Rohan
Andrew Gower as Prince Charles Stuart
Full article on YahooTv.
WARNING ‼️ There are spoilers for novellas and later books in the Comte's description.(Yes, lol)
Update: they released Claire, Jamie, Murtagh, Frank, Dougal, Colum, Angus and Rupert here.