Half-life

Fight for Equestria

Gordon Freeman teleports to Equestria due to the G-man getting distracted by a couple of Vortigaunts. Dazed and weaponless, Gordon awakes to find himself face to face with a Manticore on the edge of Sweet Apple Acres. After he gains the trust of the beautiful and giddy ponies of the land, he realizes that the G-man is willing to destroy another world to claim his prize warrior. But after the death of his closes friend, will he give in to whatever evil plan the G-man has to offer. Or will he fight with no mercy.

Taking place right after Half-life 2: Episode 2.

Silent Ponyville:

Lineage

Thunder Cloud, an alicorn stallion paranoid due to the horrible deeds of his ancestor, finds clue to a physiologist in the small town of Silent Hill. Twilight, not wanting to use a certain spell, due to her last encounters, joins him on his quest. But the two lose each other after a bridge collapse over Ghastly Gorge, causing him to believe Twilight is dead. Making his way through Dodge Junction, he finally finds Silent Hill. Waiting for him there is his worst nightmare.

(Hopefully) Taking place after Silent Ponyville 3.