Pain

Loki has felt estranged, alone, and has been maltreated. He's been abandoned by his father, he's brother, and his mother murdered. Loki is depressed and alone... or so he thinks. Loki, caught in a mission to maybe save the planet with the avengers (who knows how that happened) realizes he might just not be so alone... and maybe, just maybe they can save him from himself before it's to late.