How does a hidden cylon player receiving a sympathizer with a red resource play out?

I'm not sure this the official way, but it's how we play it in my group. The sympathizer card count as a revealed "You are a Cylon" if the resources are all blue, otherwise it counts as a "You aren't a Cylon". So a hidden cylon who receive the Symphatizer card under red condition simply continues to play as before and can reveal himself as a cylon when the rules allows it.

Seven said:

This answer will be from a base game perspective.

You follow the regular rules for the sympathizer; that is, if any resource is in the red, the sympathizer is a human (and brigged) and if all resources are blue, the sympathizer is a revealed cylon. Any player who is given a sympathizer card retains their existing loyalty cards, and they remain unrevealed

How does an unrevealed cylon receiving the sympathizer work in practice? Well, things can be weird. If the sympathizer stays on galactica and is brigged, you can perhaps get the human players to free you from the brig (maybe with an executive order!), and then reveal. This wastes their cards. However, not everyone may want to play along, so that puts you at a disadvantage.

If the sympathizer goes to the resurrection ship, there is at least a function on the resurrection ship to give away your remaining loyalty cards. However, few players think to use it unless it's necessary, so the other player passing a loyalty card might take this to mean that you're surely passing a "You Are a Cylon" card.

It all depends on your group dynamic and how the game is going.

With the rules in the expansion and the revised cylon locations, a player who is made into a revealed cylon immediately passes off their loyalty cards, so things are a bit simpler, and there can be no 'bluffing', you always pass your loyalty cards, so the other players cannot know whether you're doing it to bluff the other players or if you want to make another player a cylon.

I dont think this is a problem at all. Because by removing those loyalty cards he got until now you are removing that one cylon which makes no sense. The game is meant to be played with a certain amount of cylons, and it is probably this way because it is the most balanced way. If then the cylon player wants to spend his turn to give his loyalty card to another player, thats fine (although I think it is a waste of time to bluff since you are in a pretty hurry to lower those resources or rip them of their cards). The situation with the human players are the same. The know the certain amount of cylons among them, so this doesnt change a thing.

Yes, it is a awkward situation ingame but still not a problematic one.