User blog comment:IiLiFa/Young Justice: Invasion 208 Satisfaction images preview/@comment-4772871-20120928215320/@comment-5188108-20120929112915

I can think of a few more likely explainations than a "flashback" episode. It probably just means that The Reach and Lexcorp are working together in the episode. The fact that the "devil's alliance" (I've never heard that expression before, is it common or were they just afraid of using 'unholy'?) was formed well before this episode and encompasses far more than Lexcorp (i.e. the Light as a whole) doesn't really need to go in a one-line ad.

Or that the existing alliance is changed/expanded in a way that focuses specifically on Lexcorp.

Or that we don't learn quite as much about the Reach in earlier episodes as we think we're going to, and that the full extent of their partnership with the Light is still (intended to be) unknown to us (or at least the Team) at that point.

A flashback episode or two would be cool, but I wouldn't get my hopes up.