Several other members of the Third Race were shown during the series, often in one-off appearances.

A couple of one-off appearances followed up until issue 3152, dated 14 December 2002.

Since then Parsons has made occasional one-off appearances in various sedan based categories.

He does not do anything regularly and only makes one-off appearances.

The character made a one-off appearance in episode 1236 on November 20 of that year.

They also made one-off appearances in 2006 and 2008 to release charity singles.

The role was originally a one-off appearance, but proved so popular that he returned as the character on a number of occasions.

Makes a one-off appearance in the 1970 episode and mentions that Charlotte has died.

Palmer debuted in a third car for Williams as a one-off appearance.

There have been other characters that have made one-off special appearances over the series to great effect.