Star Trek meets Star Wars

Leave it to the British to cast Patrick Stewart in a non-speaking role (!) opposite the even more mellifluously-voiced Alec Guinness. This takes place in episode 4 of the BBC's 1979 mini-series of John Le Carre's Tinker Tailor Soldier Spy. The actor of future Star Trek Captain Jean-Luc Picard meets the actor of the recently-disembodied Star Wars "force ghost" Obi-Wan Kenobi. This encounter is even more obscure than George Takei (Star Trek's Sulu) having voiced an animated Star Wars' character as the only major crossover actor between the two series! Obvious Follow-Up Challenge: Has any other pair of Star Wars and Star Trek actors appeared together in any other movie or TV show? If not, make one up, such as Nichelle Nichols' cameo with Harrison Ford in the car in American Graffiti.