With the hand drawn animation of the alien progressing I couldn't help not to work on his 3D model, too. Now that I see him alive ( even if he is just skinned) I am tempted to work on him more with a very basic rig on his eyes, body and a few blendshapes.
His animation will be fairly simple with him entering the screen waving 'Goo Goo Ga!" like Megan mentioned. Of course this will be during the credits, as the main animation of Megan is completed.
The Alien's basic rig.