diff --git a/src/document/scene-document-validation.ts b/src/document/scene-document-validation.ts
index b38601ec..a7c522ca 100644
--- a/src/document/scene-document-validation.ts
+++ b/src/document/scene-document-validation.ts
@@ -4972,6 +4972,18 @@ function validateNpcEntity(
   }
 
   validateNpcPresence(entity.presence, `${path}.presence`, diagnostics);
+
+  if (typeof entity.targetable !== "boolean") {
+    diagnostics.push(
+      createDiagnostic(
+        "error",
+        "invalid-npc-targetable",
+        "NPC targetable must remain a boolean.",
+        `${path}.targetable`
+      )
+    );
+  }
+
   validateNpcModelAssetId(entity, path, document, diagnostics);
   const seenNpcDialogueIds = new Map<string, string>();
 
diff --git a/src/runtime-three/runtime-scene-build.ts b/src/runtime-three/runtime-scene-build.ts
index fe91466b..cb06da0f 100644
--- a/src/runtime-three/runtime-scene-build.ts
+++ b/src/runtime-three/runtime-scene-build.ts
@@ -375,6 +375,7 @@ export interface RuntimeNpc {
   actorId: string;
   name?: string;
   visible: boolean;
+  targetable: boolean;
   position: Vec3;
   yawDegrees: number;
   scale: Vec3;
@@ -663,6 +664,7 @@ export function createRuntimeNpcFromDefinition(
     actorId: npc.actorId,
     name: npc.name,
     visible: npc.visible,
+    targetable: npc.targetable,
     position: cloneVec3(npc.position),
     yawDegrees: npc.yawDegrees,
     scale: cloneVec3(npc.scale),
@@ -1742,6 +1744,7 @@ function buildRuntimeSceneCollections(
           actorId: entity.actorId,
           name: entity.name,
           visible: entity.visible,
+          targetable: entity.targetable,
           position: cloneVec3(entity.position),
           active: true,
           activeRoutineId: null,