Cobalt bomb

From TARDIS Index File, the free Doctor Who reference.

A cobalt bomb was an explosive device with greater destructive power than that of a standard nuclear weapon.

A number of advanced races had access to cobalt bombs, or the technology to create them. These included:

• Qataka (NA: Timewyrm: Genesys)
• The Greld (MA: The Empire of Glass)
• The Waro (PDA: The Devil Goblins from Neptune)
• The Cybermen (NA: Iceberg)
• The Klytode (DWAM: The Snag Finders)