His character, "Lieutenant Leslie", has the distinction of being the
first Star Trek extra character to "come back from the dead". In the
episode "Obsession", his character was killed by a gaseous cloud
creature on the surface of a planet. Later in the episode, however,
Lieutenant Leslie is seen again taking orders from his familiar station
on the bridge. The actual explanation for this, however, is that a
scene in the script that had all three members of the landing party
"killed" by the creature coming back alive in the medical room. This
scene, however, was not filmed for reasons unknown, but they still kept
Lieutenant Leslie on the bridge and in future episodes.