Belfast Giants will play Nottingham Panthers in the play-off semi-finals after Sunday's 5-3 win at Basingstoke secured an 8-4 aggregate victory.
Jason Ruff was on target for the Giants in the second leg
The Bison took the lead through Brad Cruikshank before the visitors hit back with goals from Jason Ruff, Jeff Hutchins and Marc Levers.
Greg Owen pulled one back before George Awada restored the two-goal advantage.
Mark DeSantis made it 4-3 before Jean Phillipe Morin sealed the win with the final goal on 55 minutes.
Elsewhere, Coventry Blaze overturned a 1-0 first-leg deficit against Newcastle to devastate the Vipers with an overtime winner, a 5-4 aggregate win earning a semi-final against the Cardiff Devils.
The Devils progressed despite a 2-1 defeat in Manchester against the Phoenix, prevailing courtesy of Saturday's 3-1 home win.
Sheffield's tie against Nottingham went to penalties before the Panthers emerged 6-5 aggregate winners over their great rivals.
Both semi-finals will take place at the National Ice Centre in Nottingham next Saturday, Coventry-Cardiff starting at 1300 BST with Belfast-Nottingham to follow at 1700.