1. A crazy idea by a White House staffer leads to the mission
2. Doolittle needs clearance by FDR to be allowed to fly
3. Doolittle's search for the best pilots leads him to recruit some total misfits
4. They're forced to launch early after being sighted by the Japanese picket boat
5. The raid over Tokyo so shocks the Japanese that it leads them to overreact to the threat, pull a carrier group back to defend the home island and the disaster of a decision by Admiral Yamamoto to attack Midway
6. Japan kills 250,000 Chinese civilians looking for the Raiders
Its probably the best story about America's greatest generation in WWII yet is unknown to many young people.
Here's some actual footage of the raid:
Fast forward a decade, I visited the USS Hornet (http://www.uss-hornet.org/) in Alameda, CA, a decommissioned aircraft carrier that's now a museum, and found out that the Doolittle raid launched from the Hornet! (They also picked up and quarantined the Apollo 11 capsule and crew). Very, very worth a visit.