Sonic disc

Sonic disks were sonic weapons devised by the Sea Devils when they ruled the Earth with the Silurians. They served as a kind of heat ray, capable of scorching ships and sinking them.

History
The Sea Devils used sonic discs when they awoke in 1972 and again in 2084. They had a similar larger cutting device for cutting through doors. (DW: The Sea Devils, Warriors of the Deep)

The Silurians also used sonic disks, but with bigger and longer handles. These could kill Silurians and humans. (DW: The Hungry Earth/Cold Blood)

Known victims

 * Hickman
 * Barclay
 * Drew
 * Nilson
 * Preston
 * Paroli
 * Malohkeh
 * Rory Williams

Behind the scenes

 * The toy release of the Sea Devils calls the sonic disc a heat ray.