What to know
- The Doctor side quest is available in the Phoenix City hub, shortly after you regain control there.
- You start the quest by entering the hospital to the left of the safe zone and talking to the doctor.
- The doctor wants a Vacuum Regulator, which you can only obtain from YO‑YO after getting the Gun Blast upgrade.
- Completing the delivery finishes the quest and unlocks the Let There Be Blood achievement.
In Replaced, the Doctor side quest is one of the simpler but easy‑to‑miss optional objectives tied to an achievement. Here’s how to make sure you find it and complete it in time.
Doctor side quest details
| Aspect | Details |
|---|---|
| Quest name | Doctor’s quest (Let There Be Blood achievement) |
| Game | Replaced |
| Location to start | Hospital to the left of the Phoenix City safe zone |
| Main NPCs | Doctor, YO‑YO |
| Required item | Vacuum Regulator |
| Related upgrade | Gun Blast from YO‑YO |
| Core objective | Bring the Vacuum Regulator back to the doctor |
| Primary reward | Let There Be Blood achievement, narrative flavor and completion progress |
How to start the Doctor side quest
The quest is tied to the main Phoenix City hub but is easy to skip if you rush the story.
From the safe zone, head left across the street until you spot the hospital entrance.
Enter the building.
And approach the doctor NPC to trigger the side quest.
Exhaust his dialogue; he will explain he needs a specific component to continue his work and sets you on the task.
Reach YO‑YO and get the Gun Blast
To reach the item you need, you must first meet YO‑YO and unlock a new weapon function.
Finding YO‑YO
From the same safe zone where you first started exploring Phoenix City, go right.
Look for a door you can enter; go through it.
Then proceed through the next interior door that follows.
Inside, you will find YO‑YO, an NPC tinkerer who plays a key role in your weapon upgrades.
Unlocking the Gun Blast
Once you speak to YO‑YO, you will move into a brief upgrade sequence.
Talk to YO‑YO and follow the conversation until he equips you with the Gun Blast, a new ability for your firearm.
A short testing segment follows, where you try out the Gun Blast to get a feel for its behavior and timing.
Obtain the Vacuum Regulator
The Vacuum Regulator is locked behind a dialogue choice with YO‑YO after you finish testing the Gun Blast.
Step 1: Finish the Gun Blast test
Complete the Gun Blast testing sequence in the area YO‑YO directs you to. Then return to YO‑YO afterward and initiate another conversation.
Step 2: Choose the Regulator option
When given dialogue options, select the one related to the Regulator.
YO‑YO will respond by giving you the Vacuum Regulator, adding the quest item to your inventory.
Once the Vacuum Regulator is in your possession, the Doctor side quest is essentially ready to turn in, with no extra fights or puzzles tied directly to the item itself.
Return to the doctor and finish the quest
With the Vacuum Regulator acquired, you just need to head back to the hospital.
Confirm the handover when prompted. This completes the quest and resolves his request.
Once the dialogue and turn‑in are complete, you will automatically unlock the Let There Be Blood achievement tied to finishing the Doctor quest.
There are no branching choices or alternate outcomes for this particular side quest—delivering the part is the only route to completion.
Locations involved in the Doctor quest
The entire quest plays out inside Phoenix City, using the safe zone as a central hub. The hospital lies to the left of this hub and serves as both the starting and ending point, while YO‑YO’s shop is a short walk to the right through a pair of interior doors accessible from the same safe zone.
Rewards for completing the Doctor side quest
While the quest is short, it plugs into both achievements and your sense of the city’s atmosphere.
| Reward type | Reward details |
|---|---|
| Achievement | Let There Be Blood for completing the Doctor’s quest. |
| Narrative payoff | Extra flavor on Phoenix City’s medical situation and the doctor’s role in it. |
| Progress value | Counts toward total quest completion and 100% runs in Replaced. |
Because of how tightly it’s tied to YO‑YO, you can cleanly bundle the Doctor quest with your upgrade path.
- Start the quest as soon as you first explore left from the safe zone; it takes only a short detour to talk to the doctor.
- As you naturally head right for story and upgrade progression, make sure you fully resolve YO‑YO’s Gun Blast upgrade step and then ask for the Regulator.
- Turn in the Vacuum Regulator the next time you pass through the safe zone, so you do not forget it and have to backtrack later.
If you are aiming for a 100% completion run, treating Phoenix City like a hub sweep—clearing each side quest while you are already in the area—makes it much less likely you will miss this quick achievement.
