His opponent, former Warrior Awen Guttenbeil was less impressed. He said Spencer looked like Arnold Schwarzenegger, but noted that "Schwarzenegger was never heavyweight champion of the world."
Guttenbeil said his priority was to last longer than fellow Sky Sports commentator Stephen McIvor, who was knocked out by broadcaster Clint Brown 37 seconds into his bout at the last event.
New Zealand rugby league representative Isaac Luke revealed that his boss Russell Crowe, who owns Luke's South Sydney Rabbitohs, was less than happy about his temporary change of sport.
"He blew up actually," he joked, when asked how Crowe responded. "He was filthy, but also gave me some pointers from his Gladiator role."
Luke will fight former All Black star Christian Cullen.
The charity event will have a female bout for the first time, with former Dancing with the Stars contestant Hayley Holt facing off with professional surfer Paige Hareb.
The diminutive Hareb, who weighed in 4kg lighter than Holt, mouthed to her opponent "I'm not sure I can punch you".
Others were more serious, with the showcase bout competitors Shane Cameron and ex-Warrior Monty Betham locking each other in a long, steely gaze. Cameron weighed in 300g heavier than Betham.
Tonight's event will raise funds for the Prostate Cancer Foundation of New Zealand.
