Gale, 24, joined the Bulls from Harlequins at the start of last season and scored 143 points over the course of the season, despite missing 10 games through injury.
New Bradford coach Francis Cummins said that 'Galey' would "form the backbone" of the team.
"There were some supporting artists during 2012 but Galey was very much the heartbeat of the team," said Cummins.
"Along with the young lads, he will form the backbone of the team we've got going forward."
Gale had a year left on his previous contract.