Flashback was probably the most ambitious campaign our GM had run to date. In it we essentially played three different characters, each set in a different time.
The first group of PC's were the "Independence Soldiers": Isabella Delores ("Iddy") Claire, Ringo Lassiter and Angelina Verbena. This group began the campaign in 2511, during the Unification war.
Each game session usually began with a very short segment addressing the actions of the Ex-Blue Sun Agents, followed immediately by either the Independence Soldiers or the Young Readers, which were played through as "memories" returning to the amnesiac Ex-Blue Sun Agents.
Through the campaign we essentially uncovered the "past" of the Ex-Blue Sun Agents by playing through both of the other two campaigns alternately, divided by short stints in the Ex-Blue Sun Agent's campaign. By the end of the campaign we had uncovered all the ways the two groups had crossed path and influenced one another's timelines, the Independence Soldiers had met their end, the Young Readers had reached the point where they became Blue Sun Agents and the Ex-Blue Sun Agents wrapped up the campaign with their response to the whole story line.
This was probably the most utterly awesome campaign any of us have ever played. Seriously. It rocked so hard that you would not believe.