Paul and Marie Anderson had come home early

David, actually his younger sister Claire transformed into him temporarily though planning to be David a good while, is puzzled that his own parents rang their own doorbell and are now waiting outside their own house's front door. Could they be impostors? Had they just come back to get something they needed for their trip, then found they'd lost their house keys? It was strange.

David gets the black "pen," ready to zap them into people suits. He opens the front door, greets his parents as he lets them in, and