 The episode was directed by LeVar Burton , who had previously directed more than twenty other episodes of the franchise . He had also previously played Geordi La Forge in Star Trek : The Next Generation . Scott Bakula praised Burton 's work on Enterprise , saying that he had a " great energy and a great sense of fun " and said that the flame @-@ throwers in " Extinction " got the former TNG actor " excited " . The writer , André Bormanis , was previously the science advisor for the various Star Trek series and was the story editor on Enterprise . Joining the cast in a guest role as Tret was Roger Cross , who had appeared in several science fiction series such as The X Files , Stargate SG @-@ 1 and Andromeda . He also appeared alongside Burton 's The Next Generation co @-@ star , Patrick Stewart , in X2 : X @-@ Men United . Returning in the same role in played in " The Xindi " , the first episode of season three , was Daniel Dae Kim as Corporal Chang . 
