system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who: Nightmare In Silver] The Cyberman displays superhuman speed in one scene. Why never again?
gpt
So, there are three types of Cyberman:

- "original" Cybermen, from Earth's twin planet Mondas

- Earth Cybermen, from a parallel Earth, created by Cybus Industries

- the Cybermen from the amusement park, who are a hybrid of the two.

Since these Cybermen are a combination of two different incarnations of Cybermen, they possess the knowledge base of both. Seems they came up with a speed enhancer.