Duel on the Death Star I

Galen Marek faces Darth Vader on the Death Star I and defeats him in a Lightsaber duel and rescude Garm Bel Iblis,Mon Mothma,Bail Organa,and Rahm Kota from being killed by Palpatine by is nearly killed in the incident and leaving darth vader badly injured and palpatine highly upset also ending the Great Jedi Purge in his couragous act.