At this point in time, we aren't sure if any "John Wick" actors will be appearing in "The Continental." According to Deadline, original Winston actor Ian McShane has said he won't show up in the series, but we might hear him doing some voiceovers. And as the series is set in 1975, we seriously doubt that we'll see Keanu Reeves playing a younger John Wick.
However, "The Continental" does indeed boast an impressive cast. Colin Woodell of "The Flight Attendant" will be playing the younger version of Winston, working his way through the underbelly of New York and trying to seize control of the Continental. He'll be joined by newcomer Ayomide Adegun as Charon, the Continental's dapper yet dangerous concierge.
Peter Greene (Zed of "Pulp Fiction" infamy) will play the cleaner Uncle Charlie (portrayed by David Patrick Kelly in the "John Wick" movies), and Ben Robson of "Vikings" will portray Winston's brother, Frankie. Perhaps the most impressive — and controversial — bit of casting is Mel Gibson, who will play the villainous Cormac, the proprietor of the Continental who's going to battle it out with an ambitious Winston. Rounding out the cast are Katie McGrath, Hubert Point-Du Jour, Jessica Allain, Jeremy Bobb, Mishel Prada, and Nhung Kate.