Mitrios (NCC-1701-B/5) was a Federation Starfleet class H shuttlecraft assigned to the USS Enterprise-B in the 2310s. In the year 2317, Captain Demora Sulu piloted the Mitrios to Temecklia II to track down Strolt and Zeeren. (ST - Tales from the Captain's Table short story: "Iron and Sacrifice") In 2319, the Mitrios, along with most of the Enterprise's other auxiliary craft, was used to tractor a trans-dimensional portal from the surface of Rejarris II into orbit of the planet. (ST - The Lost Era novel: One Constant Star)