You should watch:

Evolution

This was episode number 1 of season 3.

The following characters appeared in this episode:

(uncredited)Eric

(uncredited) Annette

(voice) (uncredited) Enterprise Computer

Captain Jean-Luc Picard

Counselor Deanna Troi

Commander Wiliam T Riker

Crewman #1

Doctor Beverly Crusher

Dr Paul Stubbs

Guinan

Lieutenant Worf

Lt Commander Data

Lt Commander Geordi La Forge

Nurse

Wesley Crusher