Odin Reichenbach

Odin Reichenbach is a reclusive tech billionaire who has decided the justice system does not work fast enough, so he has built the resources to fix that himself. He presents as a philanthropist with quiet, unshakeable conviction, someone used to being the smartest and most powerful person in any room he enters.

James Frain plays him with a stillness that never tips into cartoon villainy — every sentence sounds reasonable, which is what makes him unsettling. The show gives Sherlock a rare opponent who matches him intellectually, and Frain's controlled, unhurried delivery makes Reichenbach's certainty feel more dangerous than any outburst could.