This is a really hard decision. I liked all those episodes except for Pathfinder (die Carey die!!). I think Tinker Tenor Doctor Spy was hilarious, but, in the end, I went with One Small Step, which I thought was dramatically really good despite the preposterous science (which was even crazier in Blink of an Eye (did Braga steal that from Robert Forward's Dragon's Egg novel? Probably not, it would've made sense if he did) .