Written by Philip Martin, this two-part story was planned to be the fourth story recorded and third story transmitted in the original Season 23, and the story would have featured the Ice Warriors team up with Sil to ice the planet Magnus as a new home for the Ice Warriors but The Doctor and Peri notice this plan would ruin life for both of them and the Ice Warriors betray Sil... Nathan-Turner hoped to have Ron Jones direct the adventure. Martin wrote a novelization of the script which was published by Target Books in July 1990. It was later adapted by Martin for Big Finish as part of their "The Lost Stories" series in December 2009.