A Tarkalean freighter attacked in 2153 by the Borg-modified transport from the Arctic, whose two rescued survivors turn out to be partly assimilated and spread nanoprobes aboard Enterprise.
The Tarkalean freighter appears in the Enterprise episode Regeneration. Enterprise is chasing the research transport taken from the Arctic by revived Borg drones when it picks up a distress call. It arrives to find the freighter under attack and drives the transport away, but most of the Tarkalean crew have already gone.
Two survivors, a man and a woman, are taken to sickbay. Both show strange implants spreading under the skin, and before Phlox can do much they wake, attack him and inject him with nanoprobes, then start modifying Enterprise's systems.
Archer is forced to blow them out into space. The incident tells the crew what is happening to those taken by the transport and leaves Phlox racing to find a way of killing the nanoprobes in his own body with radiation.