Not bad, but only because there was nowhere to go but up. A fairly standard mad-scientist-tampering-with-things-man-was-not-meant-to-know plot (oh, and there must be a rule that if your last name is Lazarus, you are required to enter the field of immortality studies), but with some nice stuff added — for example the mysterious individual who warned Mrs. Jones about the Doctor, and some additional name-drops of Mr. Saxon.
I wonder why Saxon was funding the research….if rumors regarding his identity are true, could he be looking for a way to extend his life? It would certainly fit within the established character…..
Anyway, still not as good as the early episodes, but the preview scenes from the second half of the season look really excellent.