Cyber-Leader (Earthshock)

This Cyber-Leader planned to destroy Earth with Cyber-bombs to stop a conference leading to an alliance against the Cybermen. When its androids were destroyed and the bomb had failed, it sent the Cybermen to attack Briggs' freighter. Its cargo, unknown to the crew, was an army of Cybermen. They awoke and took over the ship. The Cyber-Leader planned to destroy life on Earth by hitting it with the craft they had reprogrammed. The craft unexpectedly traveled back in time when interfacing with the Cyber device. It hit the Earth, but only resulted in wiping out the dinosaurs. The Cyber-Leader attacked the Fifth Doctor, Nyssa and Tegan Jovanka in the Doctor's TARDIS. The Doctor ground Adric's gold star badge into the Cyber-Leader's chest. It shot at the TARDIS console and died when the Doctor shot it several times. (TV: Earthshock)

Behind the scenes
This is the first Cyber-Leader to enter the TARDIS.