of "In a Mirror, Darkly". Rush was normally the director of photography on Enterprise and was in the middle of the second day of shooting "Demons" with LeVar Burton as director, when he was asked to direct "Terra Prime" and had to leave immediately to prepare. The majority of sets created for the Martian array had been created for the previous episode, but a set was created to appear as an access tube specially for use in "Terra Prime". In order to represent the shuttlecraft entering the comet, rather than using camera movement, the set was placed on rollers and physically moved to appear turbulent. The Martian landscape was inserted using a green screen where the away team enter the array, and the actors had make-up applied to represent the red dust of the Martian landscape. Several guest stars who had appeared in "Demons" continued in their roles in "Terra Prime"; Harry Groener, Peter Mensah, Adam Clark along with Weller and Watts. A reference to Weller's former show Odyssey 5 is included in the episode, when his character is diagnosed with "Taggart's Syndrome", where Taggart was the name of his character on Odyssey 5. They were joined in this episode by several actors playing recurring roles, including Gary Graham who had played Ambassador Soval since the series pilot and Derek Magyar and Eric Pierpoint, who had played Commander Kelby and Harris respectively earlier in the season in "Affliction". Joel Swetow also appeared in "Terra Prime" as an Andorian Ambassador, who had previously appeared in the pilot of Star Trek: Deep Space Nine and The Next Generation episode "Firstborn" as well as performing voice roles for several Star Trek video games. The baby in the episode was played by a pair of twins, and the pointed Vulcan ears were added in post production. The script requested two post production shots to be added as references to the American space program, which would have been shown as the shuttlepod landed on Mars. These included the Mars Exploration Rover Sojourner which appeared in the opening titles of Enterprise, now lying dormant and covered in dust. A further shot showed a plaque which denoted the landing spot of the rover on board the Carl Sagan Memorial Station. Following the cancellation of the series two episodes earlier, Coto stated that he considered "Demons" and "Terra Prime" to be the actual finale of the Enterprise storyline,