This is a pretty nifty episode featuring telepathy, consciousness transference, traveling into unknown voids, pandora’s boxes (even if said box looks like a giant tabletop rolodex), infectuous insanity and Spock in a really dorky looking pair of goggles. Also: Leonard Nimoy so obviously has a cold during production and delivers all his lines stuffed-up. Welcomed to the series are some hand-held shots, wide-angled tracking shots, jump cuts, spooky gothic pipe organ music and nutty flashes of Brakhage-esque color treatment.