The Almondbury High School-based team, who have three Division II wins only under their belt this season, rocked strong Division I outfit Pak Rangers 7-2.
Second-from-bottom Helion stunned last year’s Sunday FA Challenge Cup winners Rangers.
The strugglers came from behind after Majid Khan’s brace had given the fourth-placed Division I outfit a 2-1 lead.
But Helion responded magnificently.
They produced their best football of the season and fully deserved their resounding victory with goals from Oliver Storrie (2), Simeon Fletcher (2), Richard Walsh, Scott Ryan and Jonny Askin.
With First Huddersfield on cup duty, White Swan seized the opportunity to maintain pressure on the second-placed Division II side with a hard-fought 6-5 win over Division I bottom side Field Head.
The lead changed hands throughout the match but Field Head would be the most disappointed having let a 5-4 lead slip with only five minutes remaining.
In Division I Britannia Sports booked their place in the Kirklees Challenge Cup final with a 4-3 victory over current holders Craven last Sunday at Leeds Road Playing Fields.
Double-chasing Britannia will now face Division I rivals Black Bull in the final at Emley’s Welfare Ground on Sunday, April 27.
Despite never losing control of the match, Britannia were forced to battle until the end by a resilient Craven side.
A hat trick from man-of-the-match Doran Jordan helped his side build a comfortable 3-1 lead.
Darren Smith had equalised for the defending champions but Jordan’s prolific finishing proved the main difference between the two top teams.
Craven kept pushing and played some neat football of their own and were rewarded when Dave Brennan reduced the deficit to 3-2.
Britannia seemed to have confirmed their trip to Emley when Alistair Cooke grabbed a fourth late on, but were made to sweat out the remaining few minutes when Sean Gant narrowed the margin on 88 minutes.
The other semi-final saw Black Bull run out 3-0 winners over Division II side First Huddersfield in a tie that was closer than the final scoreline suggests.
First were looking to avenge a 7-1 defeat that Bull laid on them in their recent Inter-Divisional game and could have had a four or five-goal lead at the break but were let down by poor finishing.
The busmen eventually cracked defensively and ended up conceding three second-half goals from David Gill (2) and David Dunne.
New Division II champions Waterloo BC added three more points to their already impressive tally when they beat promotion chasers GMB Meltham in a scrappy encounter played in difficult conditions. Richard Boustead bagged the winner in the 1-0 victory.