You should watch:

First Contact

This was episode number 15 of season 4.

The following characters appeared in this episode:

(credit only)Lt Commander Geordi La Forge
Captain Jean-Luc Picard
Chancellor Durken
Counselor Deanna Troi
Commander Wiliam T Riker
Doctor Beverly Crusher
Dr Berel
Dr Nilrem
Dr Tava
Lanel
Lieutenant Worf
Lt Commander Data
Mirasta Yale
Minister Krola