als ▁live ▁in ▁the ▁" track less ▁was tes ▁of ▁et ern ity " ▁and ▁rely ▁on ▁E ph emer als ▁for ▁their ▁thoughts ▁and ▁ideas . ▁This ▁race ▁is ▁being ▁run ▁by ▁the ▁Guard ians ▁to ▁win ▁En light en ment , ▁the ▁wisdom ▁to ▁know ▁everything . ▁The ▁Doctor ▁finds ▁that ▁the ▁E tern als ▁have ▁made ▁his ▁T ARD IS ▁van ish , ▁forcing ▁him ▁and ▁his ▁compan ions ▁to ▁stay ▁until ▁the ▁race ' s ▁conclusion . ▁ ▁As ▁the ▁race ▁continues , ▁several ▁of ▁the ▁vessels ▁are ▁destroyed ▁by ▁explos ions . ▁The ▁Doctor ▁suspect s ▁that ▁the ▁crew ▁ab o ard ▁the ▁Bu cc ane er , ▁which ▁is ▁a ▁ 1 7 th - century ▁pir ate ▁ship , ▁is ▁responsible , ▁as ▁it ▁was ▁the ▁closest ▁vessel ▁at ▁the ▁time ▁of ▁destruction . ▁T url ough , ▁while ▁attempting ▁to ▁escape ▁control ▁of ▁the ▁Black ▁Guardian , ▁ends ▁up ▁ab o ard ▁the ▁Bu cc ane er , ▁and ▁meets ▁the ▁E ternal ▁Captain ▁W rack , ▁learning ▁she ▁too ▁is ▁working ▁for ▁the ▁Black ▁Guardian . ▁He ▁finds ▁equipment ▁ab o ard ▁her ▁ship ▁that ▁appears ▁to ▁be ▁the ▁source ▁of ▁the ▁device ▁destroy ing ▁the ▁other ▁ships ▁and ▁he ars ▁the ▁Black ▁Guardian ' s ▁voice ▁nearby . ▁Later , ▁W rack ▁offers ▁the ▁Edward ian ▁officers ▁a ▁reception ▁ab o ard ▁her ▁ship . ▁During ▁the ▁reception , ▁T url ough ▁demonstr ates ▁the ▁W rack ' s ▁advantage - prov iding