Supernatural - Nothing is aliens, everything is mystical
Doctor Who - Nothing is mystical, everything is aliens
Sherlock - Nothing is aliens or mystical, real life is really that scary and depressing.
If there was a Superwholock cross over:
Sam and Dean would literally shit themselves. The Doctor would be so confused AND excited. And I’m pretty sure Sherlock would spontaneously burst into flames.
And that’s why I’d watch it…