Ian Sloan scored in the shoot-out win over Mannheimer
Wimbledon became the first English club to reach the Final Four of the EHL since Reading in 2011, on only their second appearance in the competition.
Their performance was all the more remarkable as they were in the third tier of the domestic hockey pyramid in 2009/10.
In the KO16 stage in Eindhoven Wimbledon had beaten one of the favourites UHC Hamburg, who had won the EHL title three times in the competition’s ten-year history, by 3-1.
Mannheimer opened the scoring in the13th minute when their Argentinian drag flicker and Rio gold medallist Gonzalo Peillat fired home his first goal of the tournament.
Simon Mantell (r) helped Wimbledon on their way to the semi-finals
But Wimbledon hit back with two strikes in a minute just before the end of the second period from Rio Olympians Mantell (a penalty stroke) and Sloan.
Mannheimer levelled with five minutes left through Jonathan Ehling but Wimbledon prevailed in the shoot out with five from five, scored by Sloan, Steven Ebbers, Phil Roper, Mantell and Phil Ball, while their goalkeeper James Bailey saved from Max Neumann.
Wimbledon will meet the Dutch Oranje-Rood in the Final Four (semi-finals) in Antwerp on the 3/4 June with the hosts KC Dragons facing Rot Weiss Cologne in the other tie.