Earthshock

Deep underground, two deadly androids protect a small metal hatch. Behind the hatch is a remote controlled bomb, capable of causing serious planet-wide devastation. After disarming the bomb, the Doctor traces the source of the signal controlling the bomb to a large freighter headed for Earth. Once upon the freighter, the Doctor comes face to face with one of his oldest and deadliest enemies, the Cybermen. Earthshock is a fairly memorable story on two fronts. On the one hand, it was the first appearance of the Cybermen in almost seven years. Not having been the program since Revenge of the Cybermen during the Fourth Doctor's first season. And, probably most famously or infamously, the story ends with the death of Adric. While Adric might not have been a popular or beloved companion, think of him as the Wesley Crusher of Doctor Who, his death must have come as a surprise to the show's viewers. Even though many companions had received less than stellar send-offs over the years, no companions had actually died since Katarina and Sara Kingdom were killed during The Daleks' Master Plan. Overall, Earthshock is a good story despite a few minor flaws. 

Rating: For some people, small, beautiful events is what life is all about%