Synopsis: NASA's Tidbinbilla Tracking station in Australia prepares for the re-entry of a decaying satellite containing a dangerous biological experiment. It is decided to bring it down near the station, for which job Dr Tony Masters has been brought in to assist Dr Spencer. At the same time, and unknown to her, Dr Spencer's daughter Ali has been using her computer to hack in to the station and reprogram the dish to communicate with a decommissioned satellite.