Stratos 4 (ストラトス・フォー, Sutoratosu Fō) is a Japanese anime television series by Studio Fantasia and Bandai Visual, and directed by Takeshi Mori.

[2] Fifty years before the series begins, scientists learn that a group of comets will enter the Solar System on a collision course with Earth.

All is going well until a large meteorite crashes into a lightly populated island leading the girls on a run to find out the truth about the comets.

Originally spanning a 13-episode anime TV series, which premiered across Japan between January 5, 2003 to March 30, 2003, two additional episodes were later released direct-to-video in 2004.

The series is one of the "main JSDF collaborative anime works", as noted by scholar Takayoshi Yamamura.