Alien from L.A.(1988)
A nerdy teenage girl named Wanda looks for the her who was lost in a archaeology dig in Africa. After searching through her father's notes she stumbles upon a hole leading to a city in the middle of the Earth called Atlantis. Both Wanda and her father are deemed spies by the government however Wanda gets help from a minor named Gus to avoid the government and the crime lords.
The film appeared on the show Mystery Science Theater 3000, episode 516.