Sutton United have already secured a place in League Two and it is now a battle between four teams - Torquay, Notts County, Stockport County and Hartlepool United - for the other promotion spot.
Torquay ended the regular season with four draws in a row to finish four points behind Sutton in the only automatic promotion place.
Gary Johnson's men must therefore do things the hard way by battling through the playoffs, which they enter at the semi-final stage.
Notts County have already had to overcome Chesterfield in the quarters to make it this far, earning a 3-2 victory in that one-legged tie.
It was a dramatic match between the local rivals at Meadow Lane, settled by a 90th-minute header from Mark Ellis in a game County trailed 2-1 with 70 minutes played.
The Magpies may have finished 10 points below Torquay after 42 matches of the regular season, yet there is an argument to be had that they are in better shape heading into this tie.
Whereas County have momentum on their side after beating Chesterfield, Torquay have had a two-week hiatus since their 0-0 draw at Altrincham on the final day.
That stalemate made it 13 games without defeat, though, so there is no doubt that United are the favourites of the four semi-finalists to earn promotion.
However, there was nothing to separate Torquay and County in their two league games this term, playing out a 0-0 draw in January and a 2-2 draw at Plainmoor three months later.
The pressure is now on Johnson's charges in a game that they are expected to win as they look to end a three-year exile from the Football League.
Ellis was the last-minute hero against Chesterfield and will be looking to reproduce something similar against his former club this weekend.
That was the centre-back's sixth goal since arriving at the club in March, making him one to watch, though Kyle Wootton is the visitors' go-to man with four goals in five games.
As for Torquay, they have had two weeks to rest up for this game, though that 13-day gap is not necessarily a good thing as their players may be a little rusty.
Torquay United possible starting lineup:
Covolan; Wynter, Cameron, Hall, Moxey; Sherring, Lewis, Little, Randell; Waters, Andrews
Notts County possible starting lineup:
Slocombe; Miller, Chicksen, Doyle, Rawlinson; Ellis, Brindley, Reeves, Boldewijn; Rodrigues, Wootton
We say: Torquay United 1-1 Notts County (AET, Torquay through on pens)
Torquay and County have been very tough to beat this term, and both regular season meetings between the sides finished level.
We can see a similar outcome here, though there does of course have to be a winner on the day, and we are tipping Torquay to hold their nerve in the penalty shootout.
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