Jon Pertwee on Son of Svengoolie
Jon Pertwee, who stared as The Doctor on Doctor Who made an appearance on Son of Svengoolie on November 24, 1984. Sven also showed the movie The House That Dripped Blood, which starred Pertwee a couple of weeks before that, on November 3, 1984.
See Jon Pertwee on the show here:
Watch a promo for the November 3rd show here: