Ogri The Ogri were a species of silicon - based lifeform s native to Ogros . They resembled large rocks . Biology . The Ogri looked like large rocks , usually taller than a human but irregular in shape . They were large , slow and heavy , sometimes weighing as much as three and a half tons , but they could take a lot of damage , both energy - based and physical . When awake , they would glow and make a loud rumbling noise . Like other silicon - based species , they broke down into grit when killed and also left silicon behind when they moved . ( TV : " The Stones of Blood " ) Ogri could survive erosion . As sand , they could still attack other living beings . They could use the skeletons of their victims to give themselves structure . ( COMIC : " Seaside Rendezvous " ) They fed on various types of proteins which were common on Ogros . When on Earth , the Ogri relied on blood globulin , which they could absorb by touch . They had long lifespan s , living for thousands of years . Ogri were not shown to communicate and did not show any signs of significant intelligence , although they were seen to respond to orders . ( TV : " The Stones of Blood " ) They could be modified to give them intelligence . ( PROSE : " Legacy " ) History . Circa 2000 BC , Cessair of Diplos took three Ogri from Ogros to use as protection . Cessair was captured by the Megara , but she took control of their ship and landed it on Earth in Boscombe Moor . She hid the Ogri in the Gorsedd of Boscombe Moor . These Ogri waited with the Gorsedd and it became known as the Nine Travellers , even though there were only six stones . The Ogri were fed blood by Cessair and her followers . In 1754 , Thomas Borlase did a survey of the Nine Travellers , although at the time at least one of the Ogri was not present and he recorded that there were less than nine stones . Just after the survey was completed , he was killed by an Ogri . In 1820 , Thomas Bright did a survey of the Travellers . He counted a different amount of stones than Borlase . ( TV : " The Stones of Blood " ) In 1826 , the crew of the Camara discovered an Ogri on one of their voyages and decided to bring it back England . During the trip , the Ogri killed three of the ship ' s crew members . When the ship reached the Irish Sea , the crew decided to throw the Ogri overboard instead of bringing it to their home . During the process , the Ogri killed a fourth person , but the crew were successful in getting it off the ship . ( COMIC : " Seaside Rendezvous " ) In 1876 , another survey was conducted on the Nine Travellers . In 1911 , a fourth survey of the Travellers occurred . In 1978 , Amelia Rumford came to Boscombe because of her interest in the discrepancies in surveys of the Nine Travellers . The Fourth Doctor , Romana I , and K9 Mark II came to the area during their quest for the Key to Time . A cult worshipping Cessair almost sacrificed the Doctor to the Ogri , but were stopped by Rumford . Needing blood , one of the Ogri attacked the cultists and killed them . The Ogri began following the Doctor and was led off of a cliff . Cessair took the other two Ogri onto the Megara ship . One was killed by a Megara and the last was captured by the Megara , who planned to return it to Ogros . ( TV : " The Stones of Blood " ) At least one Ogri was discovered on Earth prior to 1983 , and ended up in the care of Isaac Summerfield II in Little Caldwell . It resided in the cemetery and was routinely fed blood to keep it docile . It was instrumental in saving Little Caldwell from the attention of NATO , by killing a rogue NATO commander responsible for a number of abductions ( both alien and human ) . ( PROSE : " Return of the Living Dad " ) In 1991 , the Ogri that was dumped into the Irish Sea in 1826 began attacking people at beaches along the English coast . By this time , it had been completely eroded by the sea . It gave itself form with the skeletons of its victims . When a building caught fire in Blackpool , the Ogri was attracted to the heat . The Seventh Doctor was waiting for it with Ace . While Ace distracted it , the Doctor got the local firefighters to blast the Ogri with their hoses . After the Ogri melted into a pile of sand , the Doctor poured it into the fire where it was killed by the extreme heat . ( COMIC : " Seaside Rendezvous " ) In 2010 , UNIT had an Ogri in Underbase 1 . ( COMIC : " The Age of Ice " ) In the 30th century , Ogri had a presence in the Minerva system . In 2992 , two Ogri were part of President Vargeld ' s entourage . ( PROSE : " The Fall of Yquatine " ) In the 40th century , augmented Ogri were used by the Galactic Federation as doormen . ( PROSE : " Legacy " ) Other information . In 2008 Mr Smith mentioned that the Ogri of Ogros were noted in his data base . He added that silicon - based lifeforms like the Ogri couldn ' t survive if they were turned into stone by a Gorgon . ( WC : " The Gorgon " )