Revenge of the Cybermen is the fifth and final serial of the 12th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 19 April to 10 May 1975. Written by Gerry Davis and directed by Michael E. Briant, the serial was the first to feature the Cybermen since The Invasion (1968) and the last until Earthshock (1982).

The serial is set on Space Station Nerva, now called Nerva Beacon, and the "planet of gold" Voga, thousands of years before The Ark in Space. In the serial, the Cybermen plot to destroy Voga, as the gold there is lethal to them.

Following the serial's release, it received mixed to negative reviews. The serial has been rereleased for DVD several times and has received a novelisation written by Terrance Dicks.

Following on from Genesis of the Daleks, the Fourth Doctor, Harry and Sarah use the Time Ring to return to Space Station Nerva. They arrive aboard the space station thousands of years before the events of The Ark in Space and The Sontaran Experiment. The TARDIS is not aboard Nerva, as it is travelling back in time towards them. The trio discover that the space station is full of dead bodies, apparently the result of a plague.

The time travellers come into contact with the surviving Nerva crew, led by Commander Stevenson. The quarantined space station is now operating as an orbital beacon, warning ships away from a drifting, supposedly uninhabited planetoid named Voga, which is composed almost entirely of gold. Professor Kellman, a civilian planetary surveyor, has been using Nerva as a base for cataloguing Vogan geology, travelling there via a Transmat teleportation system. Secretly, he has entered into an alliance with the Cybermen to wipe out the station's crew using Cybermats, one of which attacks Sarah and poisons her, revealing the actual source of the "plague". The Doctor uses the Transmat to beam Sarah and Harry down and purge the poison from her body, but Kellman's sabotage leaves him unable to beam them back. Meanwhile, Sarah and Harry discover that Voga is in fact populated by a race called the Vogans, with the two being captured by a military leader named Vorus, who reveals that Kellman is in fact a double agent working to destroy the Cybermen once and for all, with Voga's gold reserves having been previously used to create weapons deadly to the Cybermen.

The Cybermen dock with Nerva and easily overpower the Doctor and the two remaining crewmembers, who they force to carry powerful bombs into the core of Voga, which will destroy the planet. Kellman beams down to Voga in an attempt to warn Vorus, but unwittingly identifies himself to some Vogans allied to Vorus' rival and the leader of Voga's government, Tyrum. After being arrested, Kellman reveals the full plan to Tyrum, leading to a truce between him and Vorus, the latter of whom reveals that his plan is to destroy Nerva and all the Cybermen on it with a missile called the Skystriker. With the missile not yet ready for launch, Sarah returns to the beacon, while Harry and Kellman intercept the Doctor and help to disarm the bombs they were outfitted with, but Kellman is killed by a rockslide.

Realising that their plan has failed, the Cyber Leader decides to crash Nerva itself into Voga. The Doctor beams back aboard Nerva and he and Sarah Jane try to turn the Cybermats on their creators, but are themselves captured and restrained. Seeing that Nerva is on a collision course with the planet, Vorus panics and launches the Skystriker, but is shot dead by Tyrum in the process. Stevenson manages to take control of the Skystriker and uses it to destroy the departing Cyberman ship, while the Doctor frees himself and steers Nerva away just in time to avoid disaster. Harry returns to Nerva via transmat and the TARDIS materialises on the station. The Doctor receives a message from Brigadier Lethbridge-Stewart asking him to return to 20th-century Earth due to an emergency. They quickly board the TARDIS and it dematerialises.

Gerry Davis wrote the initial script, titling it Return of the Cybermen. Robert Holmes' rewrite added the Vogan elements and changed Return to Revenge. Producer Philip Hinchcliffe was new to the programme; this serial was commissioned by his predecessor Barry Letts. Letts and Holmes felt that with a new Doctor coming in and at that stage little idea of how he would be played, it would be best to play safe by using familiar big-name monsters such as the Daleks and Cybermen in the first season. The script was modified as production developed to incorporate Tom Baker's style, and also had to be rewritten to modify how writer Gerry Davis had envisaged the new Doctor – as a more timid, reserved figure much in the manner of Patrick Troughton, which happened to be rather unlike Baker's portrayal. Davis was also unhappy with the story's title.