10 acts have made the final through the semi-finals, but one act who failed to make it will also perform, chosen by the judges.
Asked who he wanted to see, Sam said: I have to say I thought the Twist and Pulse dance company were brilliant.
"But I thought the young girl band Be Minor were amazing, they've got some of the tightest harmonies that I've heard in a girl band, especially so young."
He added: "I think it would be good to give them another chance."
We'll find out who the judges picked as their wildcard tomorrow night!
The Britain's Got Talent 2012 final airs on Saturday at 7:30PM on ITV1.