From Famous Monsters, a short story by Kim Newman about a Martian actor. Here they tell us about all the military roles they played during the second War of the Worlds era, including the Martian dictator Uszthay (emphasis mine, below):
"...had a whole set of shiny, slimy uniforms. I played every rank we had going. In Heat Ray!, I even got to play Uszthay, although that's like asking Mickey Mouse to play John the Baptist. I soon lost count of the number of times I had..."