The Brain of Morbius
I liked this one way more than I was expecting to. For an obvious Frankenstein homage and one of the most plainly gothic horror-tinged serials of Baker's run yet, it's surprisingly funny. Baker already started out so strong as the Doctor, but his performance seems to grow more and more confident with each new serial, and here, like in Pyramids, he does a great job of balancing the seriousness of the story with his aloof sense of humor, his quick and biting line deliveries, and that big toothy grin that says a lot with one look. These last two serials also show how far Liz Sladen had come too, who is just as totally in control of Sarah Jane as Baker is of the Doctor, and their chemistry together is just undeniably electric. This serial falls a little short for me in the lameness of both Morbius and the Sisterhood of Karn (the Doctor clowning on them constantly is one of the best things about this serial), although I did enjoy Salon as the main villain.