The games were unofficial, and gathered players from Haifa, Krayot, Nahariya, Ein HaShofet, and from other places in the North of Israel.

In the finals, that took place at the Baptist village, on June 23, 2006, the Underdogs defeated the Tel Aviv Pioneers by the score of 37-14.

In 2007, the IFL, and the Underdogs along with it, joined forces with the AFI to form the first fully equipped tackle football league in Israel.

Some of the players that participated in the unofficial games in Haifa were the ones to become the coaches and captains of the Underdogs club, and together with their colleagues from Tel Aviv, and the AFI, founded the Israeli (tackle) Football League.

The Underdogs were again knocked out of the playoffs by the Jerusalem Lions on a touchdown pass with five seconds remaining in the game.

In the 2009-10 season, the league grew to seven teams, and the Underdogs were coached by Jay Armstead and Alan Hearn.

The team's uniforms are black and white with yellow detail, with the club's logo of a blazing bulldog on the crest.