Captain Scarlet and the Mysterons (1967)

Episode 65 we look at Captain Scarlet and the Mysterons.

On a mission to Mars Captain Black and two other (Bert and Ernie (actually they where never named))

mistake the peaceful Martians scanner has a deathray which they then lay waste to the mars base, luckly 

the Martians have the ability to rebuild thier base, so no harm no foul ?... the Martains are a bit miffed and decide to destory the Earth and all Earth men ( and probably the women too although it's never mentioned)

but slow over along time bit by bit starting with killing the World President.