Beadle played 28 times for the U’s on loan from Brighton & Hove Albion last season, before his parent club recalled the goalkeeper in January and sent him to Sheffield Wednesday on loan.
The 20-year-old is with the Owls again this season, starting all 20 Sky Bet Championship matches so far.
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United head coach Buckingham said: “He obviously left us in January of last year after helping us get to where we eventually got to in that first part to the season.
“It’ll be good to see James again, but hopefully he doesn’t play well. He helped us get where we ultimately got, which is into this league, but we were able once he left to bring in Jamie Cumming, who took a little bit of time to find his feet, but really grew into the rest of that season, and is certainly now holding that number one jersey.”
On the Owls generally, Buckingham said: “They’re hard-working, organised and a constant threat. You have to match that to start with, you have to match all of that, certainly at home.
“You have to match each of those and then add your quality. We have to have quality in what we do.”