Big Finish has announced they will be releasing The Worlds of Doctor Who – Zygon Century: Transformation, a new box set of full-cast audio adventures, this April. Starring Tim Treloar and Eric Roberts, this new box set sees the Third Doctor and other Who characters confront the devious Zygons. In this upcoming box-set, the Black Cadre, a group of Zygons with a sinister scheme to infiltrate and take over Earth, make their return. The three new adventures in the Zygon Century saga are:‘1922: The Black Cadre’ by Jonathan Barnes – Zygon agents are everywhere, from Munich to Dublin and even a small asylum in Dartmoor. This upcoming boxset is available to pre-order now from the Big Finish website for £19.99 for the download or £29.99 for the download and limited edition 3-disc CD box set.