Thanks to A for the heads up.
Alexis Denisof is joining the cast of Legacies for Season 2 in a recurring role as reported by TVLine.
We’ll meet Denisof’s character, an “urbane British sorcerer” by the name of Professor Vardemus, in Episode 2. Described as “a bit of a dandy, [Vardemus] wins over the Salvatore students with his steadfast belief in the superiority of their supernatural world.”
Source: