Shaun Weiss -- famous for playing Goldberg in "The Mighty Ducks" -- is damn near unrecognizable again, but in a great way ... and that's because he's now 1-year sober.
His friend, Drew Gallagher, tells TMZ ... Shaun officially hit the milestone on January 9. He says Shaun chose to delay his Christmas as part of the celebration ... waiting to open presents on the day he celebrated his sobriety.
There's more good news ... remember the full dental sponsorship he got back in September to address his need for new teeth? Well, his permanent pearly whites -- top and bottom -- are almost done. He's wearing temporary dentures for now.
Shaun, who is still at a sober living house in Tarzana, CA, is getting ready for his next steps in life. We're told he's working on his comedy chops and doing some scriptwriting.