How do I go about adding new Campaign Cards during a campaign? I started the campaign before acquiring the IG-88 pack, but want to add the new stuff. How do I do this? Thanks!

Officially, you don't. The Imperial Player builds the Agenda deck at the start of the campaign and uses the same deck the whole way through.

However, if the other players are okay with it, you can ask them if you can swap out a set you haven't bought anything from yet with the new set.

My group was ok with replacing a set or two because it's my game we play!

Seriously though, I and one other bought the game and the other guy plays with me in the group so we just use mine atm. Someone didn't show up one game so someone else joined in using a 5th hero. We took out a random non-hero side mission and added the 5th hero's mission and reshuffled. I also dropped two Agenda sets from my deck to add the IG-88 & RG Champion sets and reshuffled. I don't have all the ally/villain packs yet but will likely not replace anything further during the campaign as it's 1/2 through at this point.

That's kind of what I figured. Thanks guys!

On the flip side, the Hero players should also get the option to swap out side mission cards from any newly acquired rebel packs.

On the flip side, the Hero players should also get the option to swap out side mission cards from any newly acquired rebel packs.

During our ongoing campaign, each time I've picked up an expansion, I've offered the rebels the option of adding the green side mission cards if they wanted them. I also asked if it would be ok to add the agenda cards (removing others to maintain the proper amount) from the new imperial packs.

I think most will be fine with adding in the new stuff during an ongoing campaign.