| 时间线 |
| 上世纪：86世纪 下世纪：88世纪 |
| 相关年份 |
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目前还没有关于87世纪具体年份的信息。 |
Speculating on the meaning of "Rep", the Eighth Doctor joked the enemy could be "eighty-seventh-century Earth Reptiles with transforming T.rex time machines" and that the entirety of human history could be a Time Lord attempt at eradicating their causal nexus. (PROSE: The Taking of Planet 5)