Hand of Omega:

The Seventh Doctor explains that the "Hand of Omega" is the mythical name for the remote stellar manipulator invented by Omega, the first of the Time Lords of the planet Gallifrey. Omega was a stellar engineer who used the Hand to create the supernova which would be the power source for the Gallifreyans experiments and subsequent mastery over time travel. The attempt resulted in a supernova that apparently consumed Omega, but instead shunted him into an antimatter universe. The supernova subsequently collapsed into a black hole, the nucleus of which was harnessed by Omega's colleague Rassilon as the Eye of Harmony, and giving the Time Lords the power to live up to their name. In homage to Omega, and to live up to their apparent "infinite capacity for pretentiousness", the Time Lords dubbed the manipulator the "Hand of Omega", presumably as a metaphor that Omega changed stars "with his touch".

The history of the Hand after its first use is unknown until its re-discovery by the Seventh Doctor. It was removed from Gallifrey by the First Doctor prior to his self-imposed exile. He then hid it in a funeral parlour in London in the year 1963.

The Hand resided in a casket that made it resemble a coffin. The casket had a dull, bronze appearance to it, but what material it was actually made from is unknown. Seemingly possessed of some basic intelligence, the Hand had the ability to levitate and follow simple orders. It was also able, on the Doctor's orders, to suffuse a baseball bat with energy, which the Seventh Doctor's companion Ace then used briefly as a weapon.

The Seventh Doctor returned to 1963, apparently to move the Hand to another hiding place. In truth, he was laying a trap for the Daleks and their creator, Davros. Davros had hoped to use the Hand to transform the sun of the Dalek homeworld Skaro into a power source for time travel. However, the Doctor had altered the Hand's programming so that instead of enhancing Skaro's sun, the Hand turned it supernova, obliterating Skaro and, presumably, the Daleks themselves. The Hand of Omega returned to Gallifrey afterward.