Halo 4 Didact, Doctor Alexander 1 game Didact, Doctor Alexander is a character from Halo 4. Verified 21 Aug 2026 Appearances Games featuring Didact, Doctor Alexander 88 Halo 4 6 November 2012 Other characters in Halo 4 Full cast Dalton Multiplayer Announcer Interrogator Del Rio Master Chief Halsey Cortana (Performance) Roland Grant Cortana (Voice), Halsey Cortana Didact
