Hosts Schofield and Holly Willoughby announced on This Morning that the final four celebrities - Sam Attwater, Johnson Beharry, Chloe Madeley and Laura Hamilton - will be performing alone this Sunday.
"Torvill and Dean took everyone on the ice last night and revealed the toughest ever challenge," said Schofield.
"They must skate alone and do a full routine, which they must choreograph themselves. They are allowed to use the professional skaters, so they can be lifted by them, but they must come up with it all by themselves and then present their final routine to Torvill and Dean."
It was also revealed that Beharry was enthusiastic and excited about the latest twist, though Madeley is apparently "scared" about the challenge.
The Dancing On Ice semi-final airs on Sunday on ITV1.