Last Cybermen from the Vogan War
The Cybermen that appeared in Revenge of the Cybermen looked very similar to the ones that appeared in The Invasion. These Cybermen were the first shown to have a weakness against gold as it chokes their respiratory systems
The Vogan War
These Cybermen had been involved in a long and costly was against the Vogans. The Cybermen were still powerful but they had a huge weakness, their weakness was gold as it choked their respiratory systems. The Cybermen wanted to destory the planet Voga as it was mostly made up of gold.