Cybermen

The Cybermen are a race of cyborgs. They used to be human, until they replaced their flesh and blood with steel and plastic. They serve as recurring antagonists throughout the series, as well as the most prominent antagonists through Seasons 11 to 13.

Abilities
The Cybermen have a variety of weapons, but their most notable ability is the ability to electrocute people by touching them, something the Cyber Controller seems to lack. They also have large factories where their prisoners can be converted into Cybermen.

Weaknesses
Different Cybermen have different weaknesses. The most notable example being Gold. This non-corrosive metal clogs up their respiratory systems.

Certain types of energy weapons can disintegrate Cybermen completely. Some Cybermen are also susceptible to high levels of radiation.

While the Cybermen are immune to bullets, bazookas can kill them. Huge doses of electricity can also kill them. A Voord's knife is capable of penetrating their armour.

Elite Cybermen
These Cybermen, first appearing in the Sixth episode of Season 2, have a chest unit with a blue light in the centre. They are much sleeker than any of the other Cybermen. They can move at very fast speeds and rotate their heads 180°, as well as detach body parts such as their hands or head. They also have blasters on their wrists which have an impressive range.

Invasion Cybermen
These Cybermen, who first appear in the fifth episode of Season 3, are mostly used as soldiers. They have death rays built into their chests.

Mondasian Cybermen
These Cybermen, first appearing in Season 6, are from a very early point in Cyber evolution. They have human hands and they carry large, hand-held, energy weapons.

Moonbase Cybermen
These Cybermen, first appearing in Season 7, have replaced their human-like hands with 3-fingered claws. They can produce arcs of electricity from their wrists to stun or kill their enemies.

Wooden Cyberman
A Cyberman made of wood appears in the first episode of Season 9. Instead of an energy blaster, this Cyberman wields a wrist-mounted flamethrower. He is defeated when the Fifth Doctor tricks him into burning a hole in his chest unit by getting him to scan his Sonic Screwdriver, which doesn't work on wood.

Wheel Cybermen
These Cybermen who first appear in the penultimate episode of Season 9 resemble the Moonbase Cybermen, except they have what look like tear drops in their eyes. As with the Invasion Cybermen, they have death rays built into their chest units.

Cybus Cybermen
These Cybermen make their debut in the first episode of Season 13, when Azaxyr and the Cyber Controller convert the prisoners on the Prison Ship into new Cybermen. They have laser blasters mounted into their wrists.

Cybershades
These are a beast-like variant of the Cybermen with bronze cyber-heads. They have the brains of cats or dogs and cannot speak, but instead vocalise electronic growls or snarls. They are very agile and also quite strong, being able to pull 2 grown men while still running at full speed. They first appear in the sixth episode of Season 17.

Signal Relay Device Carriers
These type of Cybermen have tubing on their bodies and guns built into their helmets very similar to the helmet-gun Cyberleaders, but they have silver helmets instead of black helmets. They first appear in the first episode of Season 20.

Ashad, the Lone Cyberman
Ashad was originally a human with a number of children before he was partially transformed into a Cyberman. He does not have an emotional inhibitor. When his children joined the resistance, they slit their throats. He first appears in the third episode of Season 22.

Cyber-Warriors
These Cybermen have design elements similar to other types of Cyberman, as well as spikes on their shoulders and legs. They are equipped with a wrist blaster on their right arm that are capable of killing humans as well as other Cyber-Warriors.