ED-E's first stop was a hidden Enclave outpost in Chicago for upgrades and repairs. It then traveled across the Mojave Wasteland where it was shot twice by an unidentified sniper, dealing a large amount of damage. This eventually left it deactivated near Primm, where it was found and taken in by a courier of the Mojave Express and given to Johnson Nash, the building's resident. Unable to repair it himself, Nash left ED-E to languish on Primm's branch office counter, where it remained while Primm was taken over by escaped convicts. When the Courier arrives in Primm, he/she is able to repair ED-E, allowing the eyebot to join the Courier's quest as a companion.
Although ED-E still retains all of its data and understanding of its mission, its internal positioning hardware is badly damaged. The only reason it has not been seized by interested parties is because ED-E has not communicated it's special mission to anyone.
In one of the Lonesome Road endings, ED-E sacrifices himself in order to stop the launching missiles. However he sends his memory files to his counter-part eyebot in order to preserve his memory. However as stated the Courier carried his memories on throughout the wasteland.
Interactions with the player
This character is essential. Essential characters cannot be killed.
ED-E remained forgotten in the shop of Johnson Nash, until it was repaired by another courier who let it continue on its journey to Navarro. ED-E was eventually discovered by the Followers of the Apocalypse who managed to recover vast databanks of scientific knowledge.
With its logs cleared and its systems upgraded ED-E remained a vigilant and constant companion to the Courier. The Brotherhood used the information recovered from ED-E to create a small army of Duraframe eyebots.
With its logs cleared and its systems upgraded ED-E is discovered by a traveling caravan, who take him on as a protector as they wander the wastes. The Followers of the Apocalypse used the information recovered from ED-E on Poseidon Energy, to develop new methods to harness the energy of the sun.
With its logs cleared and its systems upgraded ED-E is discovered by a traveling caravan, who take him on as a protector as they wander the wastes. The Brotherhood used the information recovered from ED-E to create a small army of Duraframe eyebots.
ED-E has a bumper sticker on its right side saying "My child is an HONOR STUDENT at Roosevelt Academy," which is a location in Fallout 3. On the opposite side from the bumper sticker is a "Great Midwest" Illinois 2062 license plate reading "2ED-E59". The numbers are more worn and faded than the letters, so a quick glance makes it appear to read "ED-E".
Regardless of who upgrades it, ED-E's appearance will be altered. If upgraded by the Followers, the armor will remain the same, but its zapper will be made more powerful, since it is the part they upgraded. If upgraded by the Brotherhood, it will result in ED-E having a much cleaner appearance, signifying its enhanced armor. Both upgrades will remove all of ED-E's stickers and the licence plate.
ED-E behaves like a human in pathfinding, which means it can set off traps (and can even be knocked down by the Ranger Takedown) even though it hovers.
ED-E does not have much HP to start with. When it is upgraded, however, it will have more than most other companions.
ED-E, like other companions, will attack enemies that come within range even when told to remain in one place. This means that it can be left in a strategic spot and will behave like a turret gun.
If ED-E is ever frenzied, it will become hostile if dismissed as a companion and returned to Primm. The only exception is if it is sent to be upgraded.
Despite its small size, ED-E has a large carrying capacity.
After having completed the game and the "ED-E My Love" quest, ED-E will give an account of what happened after the events of the game; however, its account is given using its signature beeps, so you need to have general subtitles enabled to understand them.
Even when ED-E is not directly following the Courier, he/she will still have use of the 'Enhanced Sensors' perk.
ED-E might strafe side-to-side if multiple enemies are in sight. Although it seems tactical, it won't help if the enemies have firearms.
Sometime during Lonesome Road, you will be able to obtain multiple upgrades for ED-E.
Playstation 3 If you travel to Big MT without completing ED-E My Love, the Followers option may never appear.
Xbox 360 Exiting Bloodborne Cave may glitch ED-E to be stuck in the opening of the cave. Even with the latest patch, ED-E will instead show up as a marker, but can't be found in the surroundings or in the cave. This can also happen around the entrance of Vault 22.
Playstation 3 When at Black Mountain, it is possible that ED-E will disappear after the Courier is attacked by super mutants in the small pass with the bear traps and the large boulder. It can also happen in the entrance of Vault 22. This might be fixed by going to Sierra Madre (and starting the Dead Money add-on) or by using one of the companion dismissal terminals loaded by the patch released just before the release of Old World Blues. There will be a message saying that ED-E has returned to Primm.
Xbox 360 After upgrading ED-E's armor, its inventory weight goes up from 1 to 2. Traveling to the Fort and back with ED-E as a companion permanently adds an additional 2 to its weight EACH time you go there, eventually making it impossible to place items in its inventory anymore. There is no known way to remove this invisible item weight, and the only way to prevent it is by firing ED-E before traveling there. Telling him to wait elsewhere before going to the Fort still adds the extra phantom weight. Apparently, its laser is being duplicated each time your weapons are forcibly removed at the Fort. Even if you enter the Fort without invitation, or the proper Legion reputation (i.e. bad rep, not giving weapons), this may happen. This does not happen at the casinos, though.
Playstation 3 After upgrading ED-E with the Followers, if it is destroyed, the dialogue and text about losing its perk after its death will not appear at all. You can lose ED-E without noticing its death in battles or if it strays too far from the Courier by its own way being in [DANGER] mode because of the hostiles around it. A related bug exists where if ED-E is destroyed, its perk still remains in the Courier's Pip-Boy and still fully working.
PC ED-E delivers a message from the Brotherhood after enough trigger words are activated. During the last paragraph of this speech, the speaker's dialect changes to that of a Hispanic male (possibly from one of the developers of New Vegas), and the player is stuck without being able to bring up the Pip-Boy or move. The following speech made by the Followers of the Apocalypse will not play. Quitting to dashboard and reloading does not fix this bug. However, entering enableplayercontrols via console seems to fix the problem on PC. You may also try telling ED-E to wait in a place prior to receiving the message and retrieving him later.
PC The Upgraded Zapper from the Followers of the Apocalypse upgrade can be lost at random, particularly in casinos or in Caesar's Fort. It is actually two different weapons: Energy Zap(00166B94) and Electrical Zap(001694DF), and can be restored with AddItem after targeting ED-E. They require energy cell ammunition (00078CC2), but don't actually consume it.
Xbox 360 It is possible for ED-E (after the armor upgrade) to not use its weapons and not even move. If you fast-travel or use the wait command, it will rejoin you.
Xbox 360 Sometimes while speaking to ED-E, a gunfire sound will trigger instead of the regular beeping noise.
Xbox 360 When opening ED-E's inventory, you may not be able to see the option of putting any weapons or apparel in (and possibly other items). Simply exiting the inventory screen and re-opening will allow you to put weapons and apparel in (only happened first time opening ED-E's inventory after acquiring as a companion).
If ED-E is unconscious and shot at with a explosive ED-E will explode, causing him to "die" regardless if the player is on hardcore mode or not.[verification overdue]