Star Trek: Enterprise Season 4 Episode 1

A reference is made to the US aircraft carrier USS Enterprise, which is the ship whose name Gene Roddenberry chose when he was developing Star Trek in the 1960s.

Star Trek: Enterprise is the only Star Trek series to begin a fourth season without any change in cast members from the pilot episode.

J. Paul Boehmer (SS officer) previously played the Nazi Kapitan in the Voyager episode "The Killing Game" (Parts 1 and 2), One in the Voyager episode "Drone", Vornar in the Deep Space 9 episode "Tacking into the Wind" and Mestral in the Enterprise episode "Carbon Creek".

This is the second Star Trek episode based entirely in the 20th Century. The first is The Original Series episode "Assignment: Earth", which takes place entirely in 1968.

Guest stars Joe Maruzzo (Sal) and Steve Schirripa (Carmine) both have roles in The Sopranos.

Christopher Neame (the German general) previously played Unferth in the first season Star Trek: Voyager episode "Heroes and Demons".

Tom Wright (Ghrath) previously played the title character in the second season Star Trek: Voyager episode "Tuvix".

This is the first Enterprise episode to be shot with a Digital camera. All subsequent episodes are shot this way.