In a new comic released with in conjunction with "Mission: Impossible - Rogue Nation's" DVD/Blu-ray, director Christopher McQuarrie and artist Owen Freeman reveal how Ethan Hunt (Tom Cruise) went rogue (via Wired).
The film finds Hunt on the lam when the government disbands the Impossible Missions Force (IMF). Hunt opts to continue pursuing the Syndicate instead of hanging up his post, which puts him on the run from both; the film jumps in time shortly thereafter, by about 6 months. The comic explores what Hunt did in that time.
You can check out a preview of the comic below.