You should watch:

The Last Outpost

This was episode number 4 of season 1.

The following characters appeared in this episode:

(credit only)Wesley Crusher
Captain Jean-Luc Picard
Counselor Deanna Troi
Commander Wiliam T Riker
Daimon Tarr
Doctor Beverly Crusher
Kayron
Lieutenant Tasha Yar
Lieutenant Geordi La Forge
Lieutenant Worf
Letek
Lt Commander Data
Mordoc
Portal