Billy Mckay was the hero for Inverness CT as his goal saw Duncan Ferguson's side edge past Montrose to reach the cinch Championship play-off final.
The Highland side will face Hamilton Academical in the final after John Rankin's team were 3-2 winners over Alloa Athletic in Lanarkshire.
Blair Henderson hit a hat-trick as The Spartans thrashed Peterhead 5-1 at Balmoor to remain in the hunt for a place in League 1.
They will take on Dumbarton after a goalless draw with Stirling Albion proved to be enough to see them reach the final.
In the first leg of the Pyramid Play-Off final, East Kilbride and Stranraer played out a thrilling 2-2 draw.
CINCH CHAMPIONSHIP PLAY-OFFS
cinch Championship play-off semi-finals, 2nd leg
Hamilton Academical 3-2 Alloa Athletic (Aggregate: 5-4)
Inverness Caledonian Thistle 1-0 Montrose (Aggregate: 1-0)
CINCH LEAGUE 1 PLAY-OFFS
cinch League 1 play-off semi-finals, 2nd leg
Peterhead 1-5 The Spartans (3.00pm) (Aggregate: 2-7)
Stirling Albion 0-0 Dumbarton (Aggregate: 1-2)
PYRAMID PLAY-OFFS ORGANISED BY SCOTTISH FA
Pyramid play-off final, 1st leg
East Kilbride 2-2 Stranraer
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