The Macros ( audio story ) The Macros , formerly " The Macro Men " , is the eighth and final Lost Story of Season 23 to be developed into an audio play . It stars Colin Baker and Nicola Bryant as the Sixth Doctor and Peri Brown . Publisher ' s summary . The TARDIS materialises on the USS Eldridge , after the Philadelphia Experiment has gone disastrously wrong . Most of the crew are dead , the ship is disintegrating , and the Doctor soon realises that the problem comes from another dimension . . . As they attempt to find a way to get the ship home , the Doctor and Peri visit the distant planet Capron and meet its tyrannical ruler Osloo . But the search for a possible solution only creates increasingly dire problems . Osloo ' s horizons have been widened – and space and time are hers for the taking . . . Plot . Part one . Two men aboard the a ship are talking . They check the instruments and repair some damage that one attributes to moisture at sea . He says the interface was a few seconds off . They discuss the countdown on board and what will happen when it reaches zero . The TARDIS lands and the Sixth Doctor and Peri Brown walk out . Peri notices that there is thick fog outside . Peri is trying to get back to Baltimore to contact her family . The Doctor determines that they are on a ship at sea . Peri hears two men talking , but they don ' t see her or acknowledge her when she tries to make contact with them . They are repeating their previous conversation . As Peri tries to get back in the TARDIS to leave , the Doctor tells her that he noticed something went wrong as they were materialising , some sort of interdimensional temporal flux that caught them between two dimensions . Peri looks and sees the same two men repeating the same conversation again . They decide to investigate . Peri calls the Doctor over to the capstan where he finds it covered in a strange , green rust . They notice that the ship is being eaten away by the rust . Up in the wheelhouse , the Doctor and Peri find the Captain and helmsman . The Doctor tries talking to them and notice that the Captain is just like the other men they saw on the ship , he can ' t see or hear them . The Captain initiates a 20 second countdown . Peri tries to switch off the panel , but is unable to change anything . The Doctor determines they can ' t interact because all this has already happened . At zero , the men on the bridge disappear . Suddenly , the conversation begins again . A life vest on the ship reads " USS Eldridge " and the Doctor explains that the Eldridge was the subject of invisibility experiments in 1943 . They head back to the TARDIS as the conversation on the bridge starts again . As the Doctor explains what ' s happening to Peri , they don ' t realise they ' re being watched by Brian Tessler and Bosun ( The Macros ) who are unaffected by what ' s happening on the ship . The Doctor takes a probe out of his pocket and asks Peri to find a large patch of the green rust and put the probe into it so he can take some reading back at the TARDIS . The probe has a two way communicator so the Doctor can keep track of her . Peri walks back to the capstan and the Doctor begins his diagnosis . He determines that the rust has anti magnetic elements . The Doctor begins talking to himself trying to determine where the rust is coming from . Peri screams as she is grabbed and gagged by Tessler . The Doctor shouts for the Doctor . They remove the gag and Peri explains that she and the Doctor are there to help . Peri asks why they can see her . Bosun responds that Tessler thinks it was because of where they were in the ship when the test went off , but they ' re really not sure . They all introduce themselves . Bosun says that Tessler has been working on their problem , but can ' t pinpoint a time of how long that has been . The Doctor explains that the ship is caught between two dimensions and if Tessler is able to boost the power in their generators , they should be able to pop themselves in one of the two dimensions . He says he ' s been trying to do that but each time they boost the generators it drains away without moving the ship . The Doctor explains there is another element at play , but Tessler may find it difficult to believe . On the Planet Capron , Commander Bundth introduces Presidena Osloo . She explains to the court that the traitor is her step - son , Commander Ezz who has been mislead by subversive elements of society . Currently , the planet uses slave labour to extract power for the city and Ezz wishes to stop this practice saying this is destroying the world . Osloo asks the council to pass judgment on him . " to be continued " Part two . " to be added "