Sometime around the 25th century, a team of , led by Professor Parry and financed by the Brotherhood of Logicians, embarked on an expedition to Telos, believing it to be the Cyberman homeworld and hoping to discover artefacts amongst its ruins. No Cryons were encountered during these events and it is not known what the Cryons were doing during the Cybermen's long sleep.
However, this respite was short-lived, as in the 26th century the Cybermen had once again developed into a galactic threat. When the arrived on Telos inside the tombs, the Cyber Controller captured him and imprisoned him in a refrigeration chamber. There, he met Flast, the leader of a Cryon rebellion against the Cybermen, who revealed the presence of stores of vastial in the chamber, an unstable mineral that became explosive at temperatures above 15 degrees . Using a sonic lance, they ignited the vastial, destroying the Cyber Control. With the Cybermen destroyed, the Cryons regained their planet.