You should watch:

Lonely Among Us

This was episode number 6 of season 1.

The following characters appeared in this episode:

(uncredited)Badar N'D'D
Captain Jean-Luc Picard
Counselor Deanna Troi
Commander Wiliam T Riker
Doctor Beverly Crusher
Lieutenant Tasha Yar
Lieutenant Geordi La Forge
Lieutenant Worf
Lt Commander Data
Security Guard #1
Ssestar
Singh
Wesley Crusher