29th June 2012 , 19:30 BST
A pulsating fight between two fiery Scotsmen ends as John Simpson shows his power to score a knockdown and follow it swiftly with a TKO.
Until the sixth round, the fight had been an even contest. Appleby received praise for his cleaner shots, while Simpson always looked the more imposing of the two.
Ultimately, Simpson's greater strength saw him over the line in the sixth as he overwhelmed the defending champion, first knocking him down before finishing the fight with a fierce shot to the head.
BBBofC Celtic Super-Featherweight Champion Paul Appleby defends his title against fellow Scot John Simpson in a rematch.
The two last met in 2008 in a hotly contested bout that saw Appleby snatch Simpson's British Featherweight Championship with a narrow unanimous decision.
And now the stage is set for the two to do battle once more, with a score to settle from their previous bout nearly four years ago.
Appleby's last outing saw him prevail over Stephen Ormond to win the Celtic Super-Featherweight crown live on BoxNation.
22 - 9 Simpson was last in action against Lee Selby; a fight he lost after a fifth round TKO.
The former WBO World Champ looked lean and mean as he set about his 18-year-old opponent.
After a fiery first, Harrison stepped up through the gears and knocked his Hungarian opponent down three times in the second round to delight the Kelvin Hall crowd.
It was only a matter of time before the Scotsman scored the stoppage, which he achieved in the fourth after an impressive fourth knockdown from which Mizsei couldn't recover.
Former WBO World Champion Scott Harrison makes his long-anticipated return to the ring after six and a half years away from action. He faces 18-year-old Hungarian Gyorgy Mizsei Jr., a late stand-in who will be thrilled to get a shot at boxer of Harrison's calibre.
The troubled Scotsman, who has been involved in a series of high profile incidents outside the ring, will look to rebuild his reputation when he fights on the Appleby vs. Simpson undercard at Kelvin Hall, Glasgow.
Harrison, known as "the Real McCoy", has previously held the IBO Intercontinental, British, Commonwealth and World titles at featherweight in the late nineties and early noughties.
Indeed, after winning the WBO strap, the Bellshill-born fighter defended his title several times, losing only to Manuel Media before reclaiming the belt in the rematch in 2003.