"I'm begging you! For your own good-DO NOT READ this spoiler-laden comic book before Friday December15th 2017 You'll thank me later #Wait4VIII," the actor wrote.

Is he joking? Perhaps. Or maybe he is trying to save fans from themselves.

Hamill's warning concerns issue #49 of the original Marvel Star Wars comic that began its run in 1977 and included an issue with the same title, The Last Jedi.

It is unclear what is in the issue; Heat Vision did not want the upcoming installment to be ruined.

Hamill later in the day admitted he was only kidding.

Hamill has been asking fans to be patient for months as they have poked and prodded him on social media for any sliver of information on the highly anticipated film.

So far, there has been only one trailer for The Last Jedi. Another will likely come in October. The recently released toy line for the film shed a tiny bit of light on new characters, but it wasn't much.

The Last Jedi is due out Dec. 15.

I'm begging you! For your own good-DO NOT READ this spoiler-laden comic book before FridayDecember15th 2017 You'll thank me later #Wait4VIII https://t.co/q0CS5c6K3M — Mark Hamill (@HamillHimself) September 16, 2017

Updates:

Sept. 17, 7 a.m. Hamill said he was indeed only joking about the comic.