Three classic Tom Baker/K9/Romana/er.... Adric stories producing a great story arc

Each of the three tapes constitutes a seperate story that stands by itself:

Full Circle: In which Romana's travel plans are dashed, Emboitments ensnare, marshmen rise and Space is E'd.

State of Decay: In which a bunch of miserable teenagers try and convince us that their angst is in the least bit interesting. Oh no, hang on... these really ARE vampires and they're threatening... EVRYTHING!! Help us Doctor!

Warriors' Gate: Thankfully the vampires were a bit thick and easily defeated... but what is this new threat... aaagh! Men with beards! No.. Tharils. Is there a way out of E Space? Will the Doctor and his companions return to N-Space?