sentences: )Delighted with his find, Zim quickly goes to work and succeeds at setting up his base of operations in a random suburban area on Earth, much to the dismay of The Tallest.Due to his short stature, Zim disguises himself as a human child, albeit one with a green complexion that he explains away as a "skin condition", and attends a local school (spelled "Skool") in an attempt to collect knowledge about Earth and learn the planet's weaknesses.