Fission Impossible

Fission Impossible was a limited time quest chain that was released during the Valentine's Day 2015 Event. The second quest chain from the Valentine's Day 2015 Event, Return to Sender, starts in the middle of this quest chain.

Fission Impossible Pt. 5
"Don't miss the arrival of the real Fallout Boy in Springfield. COMING SOON!"

- In-Game Message