CBS also announced that the episodes have been remastered using the original 35mm negatives for virtually flawless reproduction.

As this was an unofficial release, the six episodes included were not remastered.

This episode was remastered in 2006 as part of the 40th anniversary of the Original Series.

This episode was remastered in 2006 and first aired on March 31, 2007 as part of the remastered 40th Anniversary original series.

In 2007, the fourteen episodes were remastered into a feature film.

The episode was remastered, along with the rest of the first three series', in 1998, to bring the episode up to a standard suitable for international broadcast.

All episodes, while not perfect, have been faithfully remastered for this release.

All episodes have been restored and digitally remastered.

The episode was remastered, along with the rest of the first three series, in 1998.

CBS announced that all the episodes have been remastered using the original 35mm negatives.