It was a night like any other in Ponyville. It was, until a shooting star turned into a burning streak that roared overhead before crashing off into the distance. At first it looked like a meteor. But then it had turned, quite sharply, and flattened its trajectory, sailing uncomfortably close to the treetops.

Twilight Sparkle had dismissed the idea of visitors from beyond the stars as pure fantasy, the type of pulp novel that Rainbow Dash seemed to enjoy. Now it was a frightening possibility, and now nothing could ever be the same.

Unbeknownst to her, the accidental visitors to Equestria are just as frightened. Laws of physics that had long been understood and mastered have broken down, leaving them trapped and sitting on a possible ticking time bomb on this strange fantasia of an alien world. As utopias collide, both are faced with an event outside all comprehension, events which civilizations rarely encounter more than once, and generally the same way as a sentence encounters a full stop.

A crossover with The Culture series by the late Iain M. Banks.

In the grim darkness of the far future, cyborg supersoldier Alita is locked in battle with the mad scientist Desty Nova amongst the shattered ruins of Earth. Fighting in dreams as well as reality, the two yearn to transcend the world of suffering and carnage that has forged them. In Equestria, Twilight Sparkle is hard at work developing a new teleportation spell, and subconsciously latches on to their desire. Their starkly different worlds soon collide.

A Battle Angel Alita crossover.

Celestia has long watched over ponykind. But now, that the immortal guardians of Equestria have vanished, Twilight Sparkle and her friends are left to pick up the pieces. As conflicts begin rise among the lost ponies of Equestria, the fate of the world rests on the hooves of six ponies, and the friendship that binds them together. But will they stick together in these dark times, or will the the world tear them apart.