Debtors In Time

The year is 4037, humanity has been enslaved by a deranged scientist and collector, Dr. Ignatius Thorne, who rules with an iron fist over a dystopian world. With advanced technology and an insatiable appetite for historical artifacts, Thorne devises a sinister way to control the masses: he sends people back in time to collect specific objects from the past, using their debts as leverage.

You all owe Dr Thorne a debt and he has called you to pay up.