The young midfielder was a lare replacement for injured Michael Brown but the star of what was a super show on New Year's Day as we toppled the high-flying Toffees 5-2 at the Lane.
Dean scored twice and had a hand in another two goals on his full home debut as we climbed back into seventh place in the Barclays Premiership on Saturday night.
Reto Ziegler and Pedro Mendes also bagged their first Spurs goals and Robbie Keane tapped home the other in what was a fantastic display.
Head Coach Martin beamed: "You have to put everything in perspective and Southampton was terrific for us because we had not scored five goals at home before.
"This is the second one and overall, after 90 minutes, we played our best football.
"I'm a bit lucky because yesterday we were worried because Jermain Defoe couldn't play and Michael Brown couldn't play.
"But I said to other people 'I know Dean Marney and he's a terrific talent, he's a complete player.'
"It's his first home game for the club and scoring two goals and make another one is amazing, it's a real achievement for a young boy.
"The first goal was decisive, he knew exactly what he was doing. The second goal, he looked up and banged it in the corner, so I'm pleased with him."
Everton boss David Moyes pinpointed the partnership between Fredi Kanoute and Robbie Keane as the key factor in our 5-2 win on New Year's Day.
As it turned out, only Robbie was on target as Dean Marney grabbed the headlines with a two-goal show on his full debut at home and first start this season with first goals also for Reto Ziegler and Pedro Mendes.
Indeed, it might be said that Pedro's 20-yard cracker for 3-1 was the most important goal with Everton looking dangerous and pulling a goal back before half-time after we'd forged into a 2-0 lead.
Moyes said: "I thought we looked maybe the more liable to get an equaliser at that period but we were always under pressure from Tottenham, their forwards were hard work for us. We were always under pressure.
"I don't know how well Tottenham are playing but I know that wasn't as good as we can play, that's for sure.
"We're sore and we know we haven't done as well as we should have done, but we're still lying healthy and we'll plough on and try to get some more points."
Martin Jol was delighted with our five-star performance against Everton - naturally saving special mention for Dean Marney.