▁also ▁visited ▁Earth ▁many ▁times ▁before ▁initi ating ▁first ▁contact ▁in ▁the ▁mid - 2 1 st ▁century . ▁ ▁In ▁the ▁television ▁series ▁Space ▁Island ▁One , ▁the ▁crew ▁of ▁the ▁Unity ▁encounter ▁a ▁Bab yl onian ▁space ▁pro be , ▁the ▁Tower ▁of ▁B abel ▁having ▁been ▁a ▁ro cket ▁rather ▁than ▁a ▁literal ▁tower ▁to ▁reach ▁the ▁heav ens . ▁ ▁The ▁late - 1 9 9 0 s ▁television ▁series ▁God z illa : ▁The ▁Series ▁featured ▁gro tes que ▁ancient ▁astr onaut s ▁who ▁had ▁come ▁to ▁Earth ▁during ▁the ▁late ▁Jur ass ic ▁period ▁or ▁early ▁C ret ace ous ▁period ▁and ▁remained ▁on ▁Earth , ▁under ▁the ▁ocean , ▁ever ▁since . ▁ ▁The ▁film ▁The ▁Four th ▁Kind ▁( 2 0 0 9 ) ▁mentions ▁the ▁idea ▁that ▁al iens ▁contact ed ▁the ▁ancient ▁S umer ians ▁and ▁apparently ▁features ▁al iens ▁speaking ▁the ▁S umer ian ▁language . ▁ ▁The ▁animated ▁series ▁The ▁Trans form ers ▁dep ict s ▁the ▁Aut ob ots ▁and ▁De cept icons ▁as ▁ancient ▁astr onaut s ▁crash - land ing ▁on ▁Earth ▁four ▁million ▁years ▁ago . ▁ ▁The ▁Maxim als ▁and ▁Pred a cons ▁from ▁Be ast ▁Wars ▁take ▁this ▁theme ▁one ▁step ▁further ▁by ▁time ▁travel ing ▁to ▁pre histor ic ▁Earth ▁from ▁the ▁future ▁( the ir ▁present ). ▁They ▁discover ▁that ▁another ▁al ien ▁species ▁called ▁the ▁V ok ▁had ▁already ▁visited ▁Earth , ▁using ▁it ▁as ▁an ▁experiment ▁which ▁the ▁Be ast ▁Wars