When Mr. Moleculus shows Jake his formula for growing giant tomatoes, he borrows it to use on himself. Jacob himself grows into a somewhat round, red-skinned humanoid giant. As a result, Jacob grows huge and round like a tomato. His growth spurts Jacob went through in,Although Jacob's skin turned more red as he grew, his hair did become sort of a blackish green. By his final form, all of Jacob's clothes completely tore apart, including his pants. He had to use two window covers as clothes (one acting as a pair of pants naturally, and another acting as a shirt