I ran into a bit of a snag last night and need some clarification: during the plot phase, I revealed: "Waste their Time":  When revealed, look at each opponent's hand. Then choose 1 card from each of those hands and shuffle it into its owner's deck." and my friend revealed: "Summoning Season: 
When revealed, choose an opponent. Then, you and that opponent must each search your decks for a character, reveal it, and put it into your hands. Then, shuffle your decks." Now, a third member of our group won initiative, so marshalling and challenging would've went as so: Friend A, Friend B, My friend who had summoning season, and myself last. He says that I couldn't choose the card he drew via summoning season because all plot cards resolve simultaneously. I say BS

Giantsfan940 said:

All "when revealed" effects initiate simultaneously, but those effects resolve in an order selected by the First Player.

KristoffStark said:

So in your situation, it all depends on what the first player says. If the first player said "summoning season before waste," then you could get the character(s) retrieved with summoning season. If the first player said to do it the other way around, you could not.

Note that plots do not necessarily resolve in turn order. That is, if the first player is player #1, plots do not automatically resolve 1-2-3-4. The first player can choose any order s/he wants. It can be 4-2-1-3 is he so desires (turn order remains 1-2-3-4, of course).

I stand corrected.

ktom said:

I've been trying to convince my group of this but they all swear that it's clockwise from whoever the first player chooses to be the new first player. Can I get a rulebook or FAQ reference to back this up so we can start playing the right way? :)

From the FAQ:

(2.2) Plot Effect Resolution
Continuous or constant plot effects take
effect immediately and simultaneously, as
soon as the plot cards are revealed. The first
player determines the order in which all
"when revealed" plot effects are resolved.
"When revealed" plot effects are essentially
self-referential passive effects that initiate
in response to the revealing of the plot card
with the "when revealed" effect. They are
resolved (in the order determined by the first
player) during step 4 of the action window in
which the plot card was revealed. All "when
revealed" plot effects must resolve before any
other passive effects initiated by the revealing
of a plot card(s) are resolved.

While we are on the subject, If I reveal and "outwit" plot card and an opponent reveals "valar morghulis," will I get the chance to cancel it always, or only if my card is resolved before his?

All plots that are not "when revealed" are active from the moment they are revealed. So, for example, Power of Blood will always stop Noble characters from being killed for Valar Morghulis, not matter what "order" the First Player decides on for plot resolution (because Power of Blood is "always on," so it is valid from the moment it is revealed).

Outwit is the same way. The fact that the card has the text is "always on," so it is available to be used from the moment it is revealed. 

Awesome. Now to get my group playing the plot order right and we're in business.