|Side Quest: Stop Gizmo|
|Complete Get Gizmo's confession quest.|
|Tell Killian about Gizmo's plans.|
|Speak to Lars.|
|Kill Gizmo and Izo.|
|Reward: 600 XP|
To complete this quest, the Vault Dweller first needs to get Gizmo's confession. Once delivered, Killian Darkwater will offer the Vault Dweller the option to join him in taking out Gizmo. Should the Vault Dweller accept, they will be directed to Lars. Once spoken to and the process agreed, the Vault Dweller will be immediately transported, together with Killian and Lars, to Gizmo's office.
If the Vault Dweller refuses to go when asking Lars, the quest will be failed.
Sometimes after talking to Killian when Kenji shows up, he will not attack Killian. This prevents the quest from starting and so the rewards cannot be obtained. There is no known way around it.[verified]