Build a city!

[Jubal]

And put barbed wire around a large perimeter.

[Cuddly Khan]

They cut down all the trees for paper.

[Son of the King]

An environmental protest leads to some fresh trees being planted.

[Cuddly Khan]

 

Suicide Bombers! Chaos and panic in the streets!

[Jubal]

A blue police box turns up in the ruins of the old stadium.

[Cuddly Khan]

Atomic bomb bombs the blue police box!

[Jubal]

The stadium is destroyed. The police box isn't. 

[Cuddly Khan]

But all the paint gets scratched off, it's no longer blue.

[Jubal]

The police box disappears again, presumably to find a painter somewhere.

The arena, in the middle of the now ruined city, is left with nothing growing but a single spore of the MIGHTY MUSHROOM OF MUNDIFRON.

[Othko97]

The MIGHTY MUSHROOM OF MUNDIFRON is now so large that it has an entry in the hitchhikers guide to Exilian.

[Jubal]

The MIGHTY MUSHROOM OF MUNDIFRON now provides a safe, raised platform on which a small, furry alien species starts building residential housing.

[Cuddly Khan]

Several other mushrooms start growing around it, the spawnlings of the MIGHTY MUSHROOM OF MUNDIFRON.

[Jubal]

The spawnlings provide calm suburb districts for the small furry aliens, and are reached by means of curious teleporting devices that have a strange resemblance to table lamps.

[Cuddly Khan]

Mushroom shaped Colosseum!

[Jubal]

The mighty mushroom is now the centre of a large citadel, with the small furry aliens building their council chamber in a floating globe above the central plaza of the city.