You should watch:

The Defector

This was episode number 10 of season 3.

The following characters appeared in this episode:

(as S A Templeman)Bates

(credit only)Wesley Crusher

(voice) (uncredited) Enterprise Computer

Admiral Haden

Captain Jean-Luc Picard/Michael Williams

Counselor Deanna Troi

Commander Wiliam T Riker

Commander Tomalak

Doctor Beverly Crusher

Lieutenant Worf

Lt Commander Data

Lt Commander Geordi La Forge

Setol/Admiral Jarok