Originally born on Earth’s twin planet Mondas, the Cybermen were created as the Mondasians replaced parts of their dying bodies with plastic and steel.
Eventually they added emotional inhibitors, supressing all feelings – love, hate, even fear. Cybermen can convert humans wherever they go, and take orders from a Cyberleader, whose data can be downloaded to a drone if the leader is destroyed. Like the Daleks, the Cybermen have dogged the Doctor through space and time. He has prevented them destroying Earth’s weather system, getting their hands on the Nemesis statue and taking over Victorian London with their Cyber-King.
The Tenth Doctor visited a parallel universe, where Cybus Industries had developed Cybermen to prolong John Lumic’s dwindling life. Shortly after, these Cybusmen came crashing through to our own universe - and battled with the Daleks!
In contrast, the tin terrors teamed up with intergalactic pepper pots to imprison the Eleventh Doctor in the Pandorica.
Whilst looking for his wife, Amy Pond, Rory fearlessly faced off against an army of Cybermen and, shortly after, Craig Owens (an Earthbound friend of the Doctor), teamed up with the Time Lord in Colchester to stave off an invasion.
Invasion is always on the Cybermen’s minds. Whilst traveling with Clara, the Gallifreyan discovered an army of the silver soldiers at the “biggest and best amusement park there will ever be”, Hedgewick's World.
At the end of his time, a wooden Cyberman (along with Sontarans, Weeping Angels and Daleks) came to defeat the Eleventh Doctor at Trenzalore. It wasn’t long before the Twelfth Doctor was up against his old foes. This time the Cybermen were recruited by Missy, formerly known as The Master, as she turned the dead into a new Cyber army on Earth.
But that wasn't the last time The Master would involve the Cybermen in his dire schemes. The renegade Time Lord lured the Twelfth Doctor, Bill, Nardole and his future self, Missy, to a Mondasian colony ship, where he was creating a Cyberman race from scratch. The Cybermen were last seen fighting the colonists throughout the ship.