 " Momentum Deferred " marked the first appearance of guest actor Sebastian Roché as Thomas Jerome Newton , a new recurring villain from the parallel universe often referred to as the " Omega Man " . Newton was named in honor of English musician David Bowie , who played a character with the same name in the film The Man Who Fell to Earth . German actor Thomas Kretschmann was originally cast for the part , but was unable to be a recurring character due to a scheduling conflict . Though uncredited , Kretschmann briefly did some shooting on the set of " Momentum Deferred " ; Kretschmann was originally in Newton 's one scene in the episode , at the end when they show a sewn @-@ up head , but Roché 's head instead appears . 
