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.
"Hey Sweetie, how are your valentines coming along?"
"Almost done."
"I've sent cards to "Friends of the Forests", "Black Rhino Buddies", "Hers Helping Him-alayas", "The Million Malayan Tiger March"..."
"...and I have one very special valentine for one very special boy."
"Thank goodness. Someone a mother could cry at a wedding for."
"I'm sending a card to Fallout Boy."
"Oh. For a minute there, I thought you meant a real boy."
Fission Impossible Pt. 2[]
Character
Dialogue
"Milhouse, c’mon. We’re s’posed to be cherry-bombing Dr. Nick’s organ donor deliveries today."
"Sorry, but I’ve got a stack of valentine’s cards to write."
"Breaking hearts comes before blowing up hearts? I’ll never understand you."
"Bart, "you’ve got to give love to get love."
"I read that on the side of a very wise Squishee cup."
"These are all addressed to stuffed animals and action figures!"
"Not all of them. There’s a bunch for Lisa in there."
"You'd better stick with Puppy Goo-Goo and Headless Hellraiser instead of my sister."
Fission Impossible Pt. 3[]
Start[]
Character
Dialogue
"Lisa! Our mailbox is jammed with valentine's cards!"
"How am I supposed to get my junk mail? If I miss out on 2 for 1 carpet cleaning or a vinyl-clad window deal, I’ll be very upset."
"Let’s see… Milhouse, Milhouse Van Houten, Master Van Houten, The ‘House, Milli-Van-Illie-Houten..."
"... no Fallout Boy..."
"I know he’s a superhero with the fate of entire nations in his hands but geez... how long does it take to write your name on a card?"
"I’m going to do something that goes against every fiber of my being… play the victim."
Lisa's Job Started[]
Character
Dialogue
"Dad! Quick! There’s an emergency!"
"You have clean underwear in the laundry room."
"Not that kind of emergency. Lisa’s trapped in a tree! I can save her and finally be her hero!"
"Take an extra pair of underwear just in case."
"Any true hero would."
Sidekick Milhouse's Job Started[]
Character
Dialogue
"Milhouse! You're ruining everything! I'm waiting for the REAL Fallout Boy!"
"I’m as real as he gets. I have Fallout Boy’s cuddlebug cape, orthopaedic gloves, prescription eye mask and corrective boots!"
"But I want the REAL Fallout Boy to rescue me and carry me off to his Treehouse of Solitude."
"I’m confused. This calls for one of Fallout Boy’s super-power anxiety pills!"
"Darn! I left my pill purse at home."
Fission Impossible Pt. 4[]
Start[]
Character
Dialogue
"Lisa, could you please come down from the tree so I can save you?"
"I’ll only come down for Fallout Boy."
"Fine. In the meantime, your Mom sent over more valentine’s cards that came in the mail."
"The desperate ones are from me. FYI: They’re sealed with real teardrops."
"*sigh* Where's a hero when you really need one?"
"I might need one myself. My foot’s stuck in a woodchuck hole. But this means we can wait together!"
End[]
Character
Dialogue
"Milhouse, wake up!"
"Huh?! Whuh?!"
"One of those valentine's cards was from Fallout Boy! He finally replied!"
Fission Impossible Pt. 5[]
Character
Dialogue
"Dear LISA SIMPSON, your fan mail to Fallout Boy was received."
"That wasn’t fan mail! I spent $2.95 on that card! “Fallout Boy can’t save you for Valentine’s Day but you can save on merchandise every day from Fallout Boy’s online store.”"
"That’s nice of him."
"No, it’s not nice. This is just a robo-reply from Fallout Boy’s heartless, corporate shills."
"What are you going to do?"
"I am going to spend Valentine’s Day with the boy who actually came to my rescue."
"Who’s that?"
"You! But no physical contact and you have to wear the costume the whole time."
“
Don't miss the arrival of the real Fallout Boy in Springfield. COMING SOON!
”
— In-Game Message
Fission Impossible Pt. 6[]
Character
Dialogue
"I asked Lisa for a goodnight kiss and she said no..."
"... which is way better than last time when she ran away screaming!"
"A “no” is practically third base for a guy like me!"