Best Three, Worst Three - Season Four

Best Three:

Season Four, Episode Fourteen - Clues

Season Four, Episode Twelve - The Wounded

Season Four, Episode Five - Remember Me

 

Worst Three:

Season Four, Episode Ten - The Loss

Season Four, Episode Nine - Final Mission

Season Four, Episode Four - Suddenly Human

Not easy to chose these, as most episodes in season four, even the weaker ones, were pretty good.