Fed by Thomas Leuluai, Tomkins' stunning burst made it and, with Leuluai involved for a second time, it was Paul Deacon who slipped in Gleeson to gallop clear under the posts for his second try of the night and his 15th of the campaign.
Wigan struck after just seven minutes when scrum-half Thomas Leuluai spread the ball wide, finding Tomkins, who showed neat footwork as he joined the line to jink inside a couple of tackles and tear over.
Thomas Leuluai's break set up the first for Hansen before, almost straight from the restart, Tomkins spotted a gap to race 80 yards to the line for the try of the match.