The Dark Shadows Wiki

Adlar (Played by Pierrino Mascarino) was a Leviathan follower.

He first appeared to Barnabas Collins in a dream, in which he instructed him to obey orders of the Leviathans and kill Julia Hoffman, or else they would "force" him to obey the order. It was Adlar who claimed the Leviathans were holding Josette hostage, and if he did not follow their orders Josette would die an extremely painful death (915). Later, a séance was held in which Josette’s spirit confirmed this to be false. (948)