The actual episode was bonkers, in my marathon I got seriously worried - had they run out of ideas already? Or just money?
But it is a little like a very, very, very basic precursor to things like Midnight and Wild Blue Yonder.
This reminds me how much of a disappointment Journey to the Centre of the TARDIS was for me, I was hoping it would be an epic episode where we got to spend time in the TARDIS and explore it in ways they couldn’t do in the past, but instead it was a bit naff.
But that’s quite off topic. I need to watch this serial again to remind me about it 