The codex provides detailed information about the species, locations and technology in Mass Effect. The codex is split into primary and secondary entries. This video contains all primary entries from Mass Effect 2, which are voiced by Neil Ross.
The entry index below indicates which entries are new compared to Mass Effect 1.
Aliens: Council Races
Asari 0:02
Salarians 1:01
Turians 1:58
Aliens: Extinct Races
Protheans 3:05
Aliens: Non-Council Races
Batarians 4:14
Collectors (new) 5:25
Elcor 6:34
Geth 7:39
Hanar 8:42
Krogan 9:45
Praetorians (new) 10:53
Quarians 12:08
Reapers (new) 13:03
Reapers: Indoctrination (new) 13:25
Sovereign (new) 14:58
Volus 16:08
Vorcha (new) 17:14
Citadel and Galactic Government
Citadel 18:35
Spectres 19:36
Humanity and the Systems Alliance
Rise of the Alliance (new) 20:40
Organizations
Cerberus (new) 21:50
Cerberus: The Illusive Man (new) 23:03
Mercenaries: Blue Suns (new) 23:56
Mercenaries: Eclipse (new) 25:01
Mercenaries: The Blood Pack (new) 26:15
Planets and Locations
Aeia (new) 27:26
Freedom's Progress (new) 28:08
Haestrom (new) 29:18
Horizon (new) 30:22
Illium (new) 31:03
Korlus (new) 32:15
Omega (new) 33:24
Pragia (new) 34:34
Rakhana (new) 35:43
The Perseus Veil (new) 36:49
Tuchanka (new) 37:54
Ships and Vehicles
Normandy Armor Upgrade: Silaris Armor (new) 39:10
Normandy Shield Upgrade: Cychlonic Barrier Technology (new) 40:21
Normandy SR-1 (modified) 41:33
Normandy SR-2 (new) 42:33
Normandy Weapon Upgrade: Thanix Magnetic-Hydrodynamic Weapon (new) 43:47
UT-47 Kodiak "Drop-Shuttle" (new) 44:56
Technology
Biotics 46:11
Element Zero ("Eezo") 47:17
Mass Effect Fields 48:26
Mass Relays (new) 49:28
Omni-tool 50:40
Weapons, Armor, and Equipment
Collector Particle Beam (new) 51:24
M-622 Avalanche (new) 52:02
Medi-Gel 52:51
ML-77 Missile Launcher (new) 53:37