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A Warp star was a small pendant shaped device which contained enough energies within its small form to create a powerful explosion.
Sarah Jane Smith was given a warp star and after she escaped the Daleks on the Crucible, she informed Captain Jack Harkness that she possessed it. They planned on detonating the device within the New Dalek Empire's spacestation thus crippling it. However, the Daleks used a Transmat beam to quickly remove the threat by capturing Sarah Jane, Harkness and Mickey Smith. (DW: Journey's End)