Nottingham Forest 3 Blackpool 4 (Agg 4-6): Campbell hat-trick sinks Forest
Leading 2-1 from the first leg on Saturday, Blackpool fell behind on the night to Rob Earnshaw's early goal.
Campbell equalised at the start of the second half before Earnshaw scored his second goal of the game to level up the tie on aggregate at 3-3.
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Hide AdSubstitute Stephen Dobbie then made an immediate impact with his deflected shot wrong-footing Lee Camp and trickling into the net before two quickfire goals from Campbell sent Blackpool to the Wembley showpiece on May 22.
Forest substitute Dele Adebola scored in injury time to make it 4-3 on the night but it was mere consolation for the hosts.
Blackpool will face the winners of tonight's second semi-final, Cardiff City taking a slender 1-0 advantage over Leicester City from the first leg back to Wales.
Cardiff manager Dave Jones is under no illusions as to what promotion to the Premier League would mean for the club and for all of south Wales.
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Hide AdPeter Whittingham's exquisite free-kick has made the Bluebirds favourites to progress to the Wembley final for a shot at promotion to the top flight – worth an estimated 90m.
"It (promotion) is life changing for everybody in south Wales – that's what's at stake," he said. "But we're not there yet. And we're working hard to try to achieve it.
"It's a massive injection for everybody in south Wales."
Winger Chris Burke is facing a race against time to be fit having come off on Sunday nursing a groin strain.