Also known as Geoffrey Poloski.
Jello Jeff was a Jello salesman when he was involved in an accident at Gunbar's Jello factory. They had been experimenting with a Spingleberry flavour. Unknown to them Spingleberries were actually a rare and magical berry, that had been growing on the site of an ancient Indian burial ground. Most people were unaffected (there was very little Spingleberry in their Spingleberry Jello) but Jeff consumed mammoth quantities before he nearly drowned. He he was resuscitated he had the ability to stretch and bend his body.