You're from a different multiverse, you were in a group called the all stars. Bruce, the scientist of the group, was experimenting with the multiverse, your group had the perfect formula for time travel, now you were just testing the practical and physical aspect of it. However when you entered the dome shaped machine, it blinked and you were gone. You were now stood infront of the avengers... scared but protective, you were on guard for the barricade of questions they threw your way. @graystone527 has helped a lot with ideas and covers