'Beetlejuice' Good Genes or Good Docs?!

"It's Showtime" ... Beetlejuice and Lydia Deetz' looks over the years are scary hot!

Here is a 36-year-old version of a freaky and frazzled Michael Keaton playing the ghost with the most Beetlejuice ... and a 15-year-old version of actress Winona Ryder goin' full goth as wedding-ready Lydia Deetz back in 1988 ( left ).

And 36 years later, these two characters are being reprised for the Tim Burton follow-up film "Beetlejuice Beetlejuice" with Keaton back with the recently deceased ... and Ryder's still "strange and unusual" rockin' her iconic spiky bangs ( right ).

An exorcism is bound to happen in the new film, so the question here is: