Hello,

There's a particular "agenda" (the word agenda is not listed on it) in the game that doesn't have a doom threshold listed on it, which also replace both the agenda and act deck. Would this "agenda" have doom every turn?

Thanks

Yes. It cannot advance, but you still place doom on it.

Wow, that would make the thing that pops in the end nearly impossible (or very very hard) to beat as time goes on would it not?

Exactly. If you can't solve the puzzle box, you need to burst the monster down quickly.

Or just run and get the *bleep* out of there. Even at 0 doom that enemy is pretty tough to kill. Especially in your first (blind) play of this scenario, you are probably not going to be prepared for this Agenda if it comes into play.