Who's that knocking at my door?

I know the greenie joke has been done to death, but I don't think I've ever seen it done with an alien. Incredible Hulk? Check! Sick missionary? Check! Leprechaun? Check! Alien..?

On a side note, I've been informed that using context clues, this joke may not work. The picture on the wall is of the Paris Temple. In France, new missionaries are called blue rather than green.