PRISM

PRISM was a global military organisation that replaced the United Nations Intelligence Taskforce.

History
It was created shortly before 2066, at a time of global stability, wealth, and confidence - this showed in its flying HQ SKYHOME, a "white elephant" secret base that gave itself away with its contrails until PRISM techs could figure out a solution.

It fought the Myloki from 2066-68. The Myloki could possess or replicate people and used this to fight a campaign of sabotage, which PRISM countered in secret. While the organisation won, the UN banking system collapsed as PRISM had needed to blow its budget.

In 2070, the organisation was exposed in the memoir Message is Clear and subsequently shut down. Commander Hal Bishop took the remnants of it underground as SILOET, using what remained of PRISM's resources. The shaky cover for their headquarters, the old BBC Television Centre, was that they were a film and TV company. (PROSE: The Indestructible Man)

Behind the scenes

 * PRISM was based on SPECTRUM from the franchise, Captain Scarlet. SILOET was inspired by SHADO from the series (who used a film company as their cover).