If you have him operate in Africa and South America, how is he traveling back and forth between the regions with his converted followers? Are they attracting attention from locals (maybe he's bribing drug cartels and warlords to look the other way)? Instead of that, why not target homeless people in America? This keeps him closer to potentially useful American technology, and America has lots of mass transportation via highway and railroads with few internal security measures (weird mental image of him and his followers touring the country in a chartered bus). He can also travel almost anywhere without ever having to present any identification papers. Parts for his space ship can be kept in storage lockers (and if he's defeated, the lockers will eventually be auctioned off and the contents can wind up in the hands of criminals).
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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV
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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV