ActionScript 3.0 :: Spawning Objects To Stage And Move Certain Distance

Here is my code:
function createEnemy(event:TimerEvent):void {
var enemyAppear = new MovieClip;
enemyAppear = new Enemy();
enemyAppear.x = Math.random()*stage.stageWidth;
enemyAppear.y = 285;
[Code] .....

What I am trying to do is spawn a enemy to stage and when it appears on the stage I would like it to move across the stage a certain distance.
Visual Example:
O = enemy, X = original position, Y = new position
O (Spawns @ Location X) X ---------------------------------------------------------> Y
( Moved from location X to Location Y)