By Star Trek V: L'ultima frontiera, most of the movie Enterprise sets had been recycled to become the Enterprise-D of Star Trek: The Next Generation. The bridge had been irrevocably modified as various Starfleet bridges seen throughout the series, including the Enterprise-D battle bridge, and also became several science labs and alien interiors. A new bridge was constructed under supervision of production designer Herman Zimmerman, who wanted to show a transition to the TNG era by introducing carpet and warmer tones to the bridge. The turbolift alcoves were the only parts saved from the previous set, as they were removed during TNG's second season. Other Enterprise-D sets were reused for the film, specifically sickbay, the transporter room, and the corridors, in order to save money. Unfortunately, much of the signage and graphics were left in place, and TNG-style door labels and control panels can be seen on the sets.