Maybe the reshoots will have him shrink down to size of a mouse like ol' Gossamer from the looney tunes. He'll let out tiny little high-pitched predator roars as he runs past their feet and jumps in a tiny spaceship before flying away. Cue the final shot of everyone looking up at the sky and cussing him out.
Maybe in an after credits scene he crashes in a backyard, and get's adopted by some little girl who puts dresses on him and calls him Mr. Budkins.
"I am not Mr. Budkins! I am a highly evolved universe conquering organism!"
On a side note, did anyone else notice that soldier mannequin that was falling in the stairwell, dear god.