The Dons crashed to a third successive Championship defeat as Workington Town romped to a 33-6 victory at windswept Derwent Park.
The visitors had travelled up to Cumbria on Saturday to give themselves the best possible chance of repeating away wins over Town in the previous two seasons.
They looked to be in with every chance of doing just that when trailing by just 8-6 at the break.
But despite going close on a couple of occasions, the second half was mainly one-way traffic as Town ran in four unanswered tries to post their first win of the season.
The Dons showed a number of changes to the side beaten 13-6 by Featherstone with young Hull FC duo, full-back Curtis Naughton and prop Bobby Tyson-Wilson making their league debuts for the club.
Hooker Stuart Howarth, the third dual-registered player in the Doncaster team, formed a new half-back partnership with player-coach Paul Cooke.
Both sides went close before Town opened the scoring on 13 minutes – winger Sam Forrester winning the race to scrum-half Carl Forber’s kick to the corner.
Town doubled their lead with a try in the opposite corner, dual-registered Wigan winger Dom Manfredi touching down from Forber’s high kick to the flank.
Town continued to make most of the running and the Dons struggled to threaten the Town line until the half-hour mark when second-rower Pas Dunn, whose dad Reg played for Town’s arch-rivals Whitehaven, forced his way over from acting half-back.
Dave Scott, standing in for Cumbrian Stu Sanderson, added the extras to leave just two points separating the sides.
Forrester did well to bundle his opposite number Sam Doherty into touch when looking a likely scorer.
Doherty again went close just before the break but Howarth’s teasing grubber kick had too much weight on it.
Town opened up 14-6 lead soon after the break, Callum Phillips backing up a break by man-of-the-match Tom Walker.
Manfredi got back to nail Scott when the Dons threatened a try on 54 minutes.
Town extended their lead to 20-6 with a well-worked converted try by centre Perry Whiteley three minutes later.
Any comeback hopes the Dons may have entertained were effectively dashed following a close-range converted try by prop Karl Olstrom.
It took some excellent defence to deny Doherty a third try of the season prior to Town wrapping things up with a sixth try and a drop goal.
Workington Town: Murphy, Forrester, Mossop, Whiteley, Manfredi. Doran,Forber, Walker,Mattinson, Shackley, B Phillips, Horton, Stack. Subs: C Phillips, Olstrum, Scholey, Fifita.
Dons: Naughton, Doherty, Waterman, Welham, Scott, Cooke, Howarth, Tyson-Wilson, Emmett, Clark, Kelly, Dunn, Snitch. Subs: Spiers, Waller, Carbut, Kesik.