#StarTrek 40 (1967) - 10/10
Mirror, Mirror, written by #JeromeBixby.

1️⃣ One of the best and most exciting episodes. It's a thriller. From the moment they arrive, Kirk and co. are under pressure. They could be found out at any second.

2️⃣ #BarbaraLuna's Marlena Moreau is one of the show's best and most sympathetic guest characters. She gets a great arc. As does the mirror universe version of Mr. Spock.