Botler and Uncle Zak have organised a farewell party for Sam and Amber. They play a game, collecting hidden numbers that they have to order and give the next number in the sequence. They call Numberella, who helps them to look at the differences between the numbers. The next number in the sequence is 20. Sam and Amber enter number 20 into the snakeliser and this activates a zimmerjet holding a beautiful model of the compound – a surprise leaving present from Uncle Zak.