Lileth from Cheers is not the best example because Cheers and Frasier are linked.
It's more like ET driving the spaceship in Independence day.
It's a character from one film appearing in another of the same genre, sometimes with Brilliant results.
I love this image.
Yup! It's always been Mr. Spock. I once won a prize for writing a short poem about him. Who, by the way is Robert Downey Jnr. (Not being sarky, I honestly don't know.)