You should watch:

Frame of Mind

This was episode number 21 of season 6.

The following characters appeared in this episode:

(uncredited)Guard
Administrator
Attendant Mavek
Captain Jean-Luc Picard
Counselor Deanna Troi
Commander Wiliam T Riker
Doctor Beverly Crusher
Dr Syrus
Inmate Jaya
Lieutenant Worf
Lt Commander Data
Lt Commander Geordi La Forge
Wounded Crewmember