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"Storm Front" is the fourth season premiere of Star Trek: Enterprise and the first episode of a two episode arc.
Trip Tucker and Travis Mayweather are piloting a shuttlepod toward Starfleet Headquarters in San Francisco to discover why they have lost all communication with Earth since the destruction of the Xindi weapon. Their "First Contact" comes in the form of an attack from a small formation of aircraft. Tucker attempts to contact the planes, but they refuse to answer. Mayweather recognizes the aircraft as P-51 Mustangs, World War II-era aircraft. He explains to Tucker that he has seen the same design of plane before at air-shows. The aircraft seem to be breaking off, so Tucker looks for a landing area on the ground. However, the planes were simply making sure they wouldn't get hit by heavy anti-aircraft artillery being fired at the shuttlepod. When the shuttlepod's starboard engine is damaged, Tucker and Mayweather flee back to the orbiting Enterprise.
Captain Archer, having recovered from his wounds in a Nazi field hospital, is being transported as a prisoner-of-war in the back of a large truck. A Nazi officer belittles the American war effort, causing Archer to suspect that he is in Earth's past. However, the officer's swagger and manner of discussion lead Archer to suspect that he may be in an alternate timeline...