Lectra energy was a type of energy which was leaked by power-boosted transmats. While searching for the missing guests of Platform One in the year 5,000,000,000, the Tenth Doctor found a book in the Reading Dome of the University of Rago Rago 56 Rago which told him to search for lectra energy leaks, which he found at all the places he and Rose Tyler had recently visited, and located the most recent leak at Gameworld Gamma. (COMIC: The Hunt of Doom)