Kerblam! is the biggest online retailer in the galaxy - but how did it become so big? When the Doctor's Kerblam! package includes a mysterious request for help, she heads straight to the company's warehouse moon to investigate. Going undercover as Kerblam! workers, the TARDIS fam find that several human employees have vanished in sinister circumstances. Could the automated workforce be to blame? Or has the whole operation been compromised by forces unknown? The Doctor soon learns that when it comes to wrapping things up, she has nothing on Kerblam!