Review of all episodes on Blu-ray.
This is a solid start to the fourth doctor. It isn't as memorable as some serials and the tech is very dated, but the regeneration goes well and Tom Baker is quiet good from the first. Liz Sladen is also good and anything she is in is more pleasant for her presence.
The commentary, making of, and behind the sofa extras are nice if standard. The bit on Target books and Terrance Dicks is a great 20 minutes if you like the books.