missing npc with saga quest active?

where should we add missing npc with saga quest active? npc like Interim Engineer , hector are missing when saga episode are being watched.

Probably both this page and the Episode's page.

It's most relevant on the npc's page, and should also be mentioned in the details of the specific quests where they disappear or reappear, and in a warning near the top of the page, probably just above the NPC table(outside the spoiler box if we're keeping those).