Some days ago, I had a dream that I watched footage from an early cut of ROTJ. Here’re the details I recall from the dream:

Luke had a different lightsaber. It was mallet-shaped, with a red blade.
There was a scene of Luke slaughtering Ewoks.
The big plot twist wasn’t that Leia was Luke’s sister, but that Darth Vader was actually his GRANDfather. Luke’s actual father had never fallen to the dark side; he might not have even ever been a Jedi.

“Anakin” was played by Mark Hamill himself. Here’s what Mark looked like in the old-age makeup: