A golden-point try to Auckland Vulcans centre Sione Lousi sent the Warriors' feeder team into the final of the NSW Cup and completed a remarkable treble for the club.
The Warriors, the under-20s and the Vulcans will all contest their respective grand finals next weekend.
The Vulcans overcame a tough Cronulla Sharks' second-string outfit 30-26 to book their place in the showpiece game of the competition at Leichhardt Oval.
Up to 10 players who have played first grade were part of the Vulcans side, including centre Shaun Berrigan and five-eight Brett Seymour and they will meet the winner of the Canterbury-Bankstown Bulldogs versus North Sydney game.
The junior Warriors will defend their crown against the North Queensland under-20s after they hammered the Bulldogs 64-0 yesterday.
Manly lies in wait for the senior Warriors' side, after they stunned the Storm in Melbourne last night 20-12 in the preliminary final.
Next weekend will mark the first time the Warriors have played in a grand final since their 2002 loss to the Sydney City Roosters.