Kidnap

Kidnap (キッド·ナップ, Kiddo Nappu) is the fourth episode of the anime series Full Metal Panic!
==Summary==
Chidori and Sousuke's class go on a field trip to Okinawa, but Gauron, a terrorist operative, hijacks their plane and diverts it to a base near Lake Khanka in the USSR. The terrorists kidnap Chidori and subject her to scientific testing. Unable to bear the thought of her potential fate, Sousuke infiltrates the base and attempts to rescue Chidori.