Magellanic Cloud, Tuvok's wife, T'Pel, came to live aboard the ship. Lieutenant Alyssa Ogawa is a human female. Like Riker and Troi, Alyssa Ogawa served for a number of years on both the Enterprises, having begun her Starfleet service aboard the Enterprise-D as an Ensign and nurse under Dr. Beverly Crusher in 2367. At the recommendation of Crusher, she was promoted to Lieutenant junior grade in 2370 and became a senior sickbay staff member as Head Nurse. She would report to the command staff of the vessel in Crusher's absence. She also married Lt. Andrew Powell in the same year, and the two had a son. Powell was killed during the Battle of Rigel during the Dominion War, and though Ogawa did transfer to the Enterprise-E, she readily took the opportunity to leave the vessel with her son and serve within the Titan's sickbay. Dr. Shenti Yisec Eres Ree is a Pahkwa-thanh male. The chief medical officer of the starship Titan, Dr. Ree's friendly bedside manner is juxtaposed by his fearsome appearance. Standing over two meters tall, this bi-pedal reptile reminds Captain Will Riker of one of Earth's extinct, pack hunting dinosaurs. Lieutenant Commander Ranul Keru is an unjoined Trill male. The chief of security and tactical officer, Commander Keru was rendered comatose from injuries sustained during a battle between Romulan and Reman forces. Captain Riker subsequently offered the post to Tuvok until Commander Keru's recovery. Upon his awakening, Keru opted to remain security chief, leaving Tuvok as tactical officer. Keru had served previously on the Enterprise-E where he was romantically involved with the Star Trek: First Contact character Lieutenant Hawk. Lieutenant Commander Jaza Najem is a Bajoran male. He serves as chief science officer. Originally serving in the Bajoran Militia, he entered Starfleet when Bajor joined the Federation in 2376. He was briefly romantically involved with first officer Christine Vale. Jaza left the Titan when he stranded himself in the distant past of Orisha in order to get the rest of the crew back to their proper time period. Commander Xin Ra-Havreii is an Efrosian male. He worked at Utopia Planitia as a head designer of the Luna-class, holding a doctorate in warp field mechanics and a reserve rank of commander. Traveling with the crew on Titans first mission, he took over as chief engineer after Lieutenant Commander Nilani Ledrah's death. Lieutenant Commander Melora Pazlar is an Elaysian female.