You should watch:

Phantasms

This was episode number 6 of season 7.

The following characters appeared in this episode:

(as Gina Ravarra) Ensign Tyler

(uncredited) Ensign Gates

(uncredited) Ensign Jae

(uncredited) Ensign Kellogg

(uncredited) Lieutenant Farrell

Admiral Nakamura

Captain Jean-Luc Picard

Counselor Deanna Troi

Commander Wiliam T Riker

Doctor Beverly Crusher

Dr Sigmund Freud

Lieutenant Worf

Lt Commander Data

Lt Commander Geordi La Forge

Workman