Meanwhile , Joanna is ordered to rescue a Maian survivor named Elvis from Area 51 who is key in stopping the conspiracy . She succeed and the pair work together to rescue the president . She learn the conspirators are actually Skedar aliens disguised as Scandinavian humans who intend to test the weapon on the Earth before using it against the Maian homeworld . Without permission from the president , dataDyne elect to hijack the deep sea vessel and take it to the ancient alien spacecraft . With the help of Elvis , Joanna follow where she find a reprogrammed Dr. Caroll decoding the megaweapon . She replace its current personality with a backup of the original , and the restored Dr. Carroll set the weapon to self @-@ destruct in order to protect Earth . In retaliation , the Skedar capture Joanna and take her to their homeworld . Elvis rescue her and she then kill the Skedar High Priest , leaving the Skedar in disarray . The game end with Elvis and Joanna leaving the Skedar planet just prior to an orbital bombardment from the Maian navy .