This is a four part BBC serial from 1975. Tom Baker is featured as the Doctor with his companions, Sarah Jane (Elisabeth Sladen) and Harry Sullivan (Ian Sullivan). The TARDIS materializes on a space station in orbit around the earth. Humans are in suspended animation chambers on board and huge wasp creatures are using them as hosts.
The image quality is pretty good, without any noticeable compression artifacts. This is a 2 disc release, with all of the extras from an earlier 1 disc release, plus some new extras. I highly recommend it to anyone who enjoys classic science fiction television.