You should watch:

Tin Man

This was episode number 20 of season 3.

The following characters appeared in this episode:

(uncredited)Engineer
(voice) (uncredited) Enterprise Computer
Captain Robert DeSoto
Captain Jean-Luc Picard
Chief Miles O'Brien
Counselor Deanna Troi
Commander Wiliam T Riker
Doctor Beverly Crusher
Lieutenant Worf
Lt Commander Data
Lt Commander Geordi La Forge
Romulan Commander
Tam Elbrun
Wesley Crusher