Reality bomb

The Reality bomb was a superweapon created by Davros.

The weapon made use of the 27 planets of the Medusa Cascade captured by the New Dalek Empire along with the unique energy source of the Crucible. This bomb cancels out the electrical field holding atoms together and is capable of wiping the entire universe and all of creation, except for those within or near the Crucible. The reality bomb was planned to destroy all other forms of life except the Daleks, to make them become the only race in the universe..

The Doctor was successful with his companions in preventing the use of the weapon although his clone did use it to destroy the Daleks. (DW: Journey's End)

The reality bomb is similar to the supernova bomb from previous Doctor Who writer, Douglas Adams' story Life, The Universe and Everything, which was in itself based on an abandonned Doctor Who story Adams had written.