Doctor Who (1963): The planet Peladon, some time in the future. The Doctor and Jo arrive just in time to get involved in the conference to discuss Peladon's admission to the Galactic Federation. But the King's closest counsel has been murdered, apparently by a ghost…
Elisabeth Sladen, Frazer Hines, Jacqueline Hill, John Levene, John Scott Martin, Jon Pertwee, Katy Manning, Nicholas Courtney, Pat Gorman, Patrick Troughton, Peter Davison, Tom Baker, William Hartnell, William Russell
Adventure, Drama, Sci-Fi
Maybe also available here.