Flashback

 Flashback is a Tier 2 Duo included with the Lightning Strikes Episode. Access to the Duo requires a Combat Rating of 43 and rewards 2 Marks of Victory for players with a Combat Rating between 43 and 64. Players with a Combat Rating higher than 64 only receive Loot items from the Duo.

In-Game History
Learning that someone was tempering with his past, the Flash (Barry Allen) sends a pair of heroes to the night of the lightning strike via the Cosmic Treadmill to stop the meddlers from altering the timeline.

Duo Description
Someone is tampering with the past to prevent Barry Allen from becoming the Flash!