Valerie Carlton Valerie Carlton was a journalist who accompanied Edward Perkins on his expedition into the Amazon rainforest to find out what happened to his great - grandfather ' s expedition . While on the plane , she asked the Fourth Doctor about UNIT and alien invasions . When the plane crashed , she and the Doctor were captured by a tribe of natives and taken to their camp . When they were taken to their leader , they found out it was Edward Perkins great - grandfather Cornelius . When they asked asked the professor what year it was , he said 1873 , and when he asked them what year they thought it was , she responded it was 1977 . Intrigued by what sounded like a spaceship in the professor ' s diary , the Doctor asked Cornelius to take him to it . When they reached the spaceship , they found a skeleton with sharp teeth . When they decided to enter , the professor stayed outside , while Valerie and the Doctor entered . They found the ship had been stripped of its controls . When the spaceship started to topple over the cliff it was on , the Doctor managed to use the gravity inversion drive to fly the ship back onto the cliff . When they found the lost city of the Maygor tribe , they were captured by the Maygor and taken to their " God " Godrin . Godrin had captured Edward and Leela and questioned them . He explained that he was the last of the Luron , a race of yellow skinned aliens with sharp teeth . He then said that his race accidentally destroyed their sun , so the last survivors went to other planets and stop them from the same fate . His ship was struck by a meteorite storm , and he crash landed on Earth , and his co - pilot was killed . The Maygor found him and thought him to be one of their gods . He then said that they were in a time bubble , and that it slowed down time . After Godrin explained himself , it was revealed the professor was actually working for Godrin , who had promised to return him to his own time and be given some of the Maygor ' s gold . When the professor attempted to leave Godrin killed him . When Godrin asked to go to London , the Doctor accepted and repaired the plane with the gravity inversion drive and flew to London . When they called into air traffic control at an airport , they discovered , while in the time bubble , two years had past and their expedition was thought to be lost . When they got off the plane , Godrin betrayed them and revealed he was not the last Luron , and that the Luron mothership was orbiting Jupiter . He then knocked them out with a sonic device . When Valerie recovered , she woke the Doctor up and they set out after Godrin , leaving Edward and Leela behind . The Doctor guessed that Godrin would make to a broadcasting station . Godrin did , and contacted the mother ship and told them to come into Earth orbit . After that he left . Valerie and the Doctor then went to UNIT HQ , and while there , General Hemmings took Valrie ' s camera to prevent her from taking any photos . Watching the television , Valerie saw a plane heading towards the mothership , and remembered it as the plane they left at the airport , and the Doctor guessed it was Godrin heading towards the mothership , and with Edward and Leela on board . When Overlord Saldor announced that they would allow humans to come aboard their mothership , Valerie went with the party . When the Luron plan was finally defeated , Overlord Saldor invited Edward and Valerie to come with the Lurons to a new planet . They both accepted . ( AUDIO : " The Valley of Death " )