Steven Fletcher’s brace and an Atdhe Nuhiu strike gave Wednesday a thoroughly deserved win at Charlton.
Fletcher struck first before Macaulay Bonne equalised but a late Owls flurry spawned two more goals, another for Fletcher with Nuhiu putting the contest to bed.
It was a good all-round show from Wednesday, who had the ball in the net inside five minutes when Nuhiu glanced a Fernando Forestieri free kick home but an offside flag cut short the celebrations.
Forestieri then had a go himself from range only to see his daisycutter fizz the wrong side of the post.
There was no margin for error, though, on 17 minutes as Wednesday hit the front.
Barry Bannan delivered a first class cross into the box and Fletcher expertly directed his header into the far corner.
The Owls pushed forward having seized the advantage and it could and should have been 2-0 on 25 minutes.
Dillon Phillips produced a super save to keep out Fletcher’s header and Forestieri somehow scooped the rebound over the bar from inside the six-yard box.
And Wednesday were made to pay for that profligacy as the Addicks equalised a small matter of 75 seconds later.
Alfie Doughty centred for Bonne and the young striker saw his scuffed shot bobble in with the aid of a deflection off the unfortunate Tom Lees.
The Owls regrouped, promptly regained their composure and looked the more likely with half time approaching.
And Charlton had Phillips to thank for going down the tunnel on level terms when the keeper darted off his line to thwart the onrushing Bannan.
Wednesday started the second period with intent and again it was Phillips to the rescue, once more denying Bannan, this time throwing himself to his right to parry round the post.
The visitors then went on to assume more control, limiting the Londoners to rare counters, but they needed another breakthrough.
Pressure came from both flanks and Harris was inches away on 65 minutes, thwarted by Phillips’ diving save after cutting in on the angle.
Harris curled inches wide from the Owls’ next attack as Charlton were pinned back in their own half.
And Wednesday got their reward with 11 minutes to go from the penalty spot. Erhum Oztumer tripped Jacob Murphy down the right and up stepped Fletcher to double his tally.
The Addicks launched a late rally and ex-Owls loanee Deji Oshilija went close from distance but Garry Monk’s men made the game safe in stoppage time.
Adam Reach delivered the perfect cross onto the head of Nuhiu, who made no mistake with an emphatic finish in front of the travelling hordes.
Wednesday: Dawson, Odubajo, Lees, Iorfa, Fox, Harris (Reach 80), Hutchinson (Luongo 77), Bannan, Forestieri (Murphy 46), Fletcher, Nuhiu