Jason tries building a model of the Opera House but isn't sure what it looks like. Using instructions from Ebony, Sam and Darren build a molecular exciter detector out of fridge magnets and garden shears. The pointy end leads them to the device in Grubs' back pocket but they don't know how to retrieve it without him knowing. The fate of the planet will depend on Darren stealing it back. The Grubs send a second musical countdown message to announce their arrival in eight days.
