The direct stimulus:
Today's dream retrieval: "Those feet are covered in intergalactic spit! They can't be allowed to touch Earth!"
Nothing beside remains.
The result (originally parceled out in tweets, and now slightly amended and collected):
THE NEW NEW JERSEY
And shall those feet, in future times
Moisten our planet's precious soil?
And will the spawn of Ab'rop'od
Spit upon our blood & toil?
Bring me my belt of blazing jet!
Bring me my telescope of light!
Bring me my plans—unfurl them here.
Bring me microbes with hungering bite!
I will not shirk the cosmic fight,
Not drop this phaser from my hand
Till we have shed this eldritch blightAnd scoured the Martian from our land!
(ttto: Jerusalem, words by Blake, tune by Parry)