An injured alien found aboard a drifting ship on the border of a xenophobic species' space, who warns Voyager's crew what the swarming vessels do to trespassers.
Chardis is a traveller whose ship strays into the territory of a little-known species that tolerates no visitors. He appears in the third-season Voyager episode The Swarm.
Captain Janeway decides to cut across the region to save more than a year of travel. On the way the crew comes upon a disabled vessel with a single survivor. Brought to sickbay, Chardis describes how thousands of small ships fastened on to his hull and drained its energy.
He dies soon afterwards, his treatment not helped by the fact that the Doctor's memory is failing at the time. His account is borne out when the same ships surround Voyager.