After the events of Bowser Jr.'s Journey, the minions at the castle who stayed behind were mortally wounded by Fawful's forces. Many Thwomps were cracked, Biddybuds had broken legs, Sumo Bros. had broken arms, Koopas had broken shells and Goombas were flattened.

Boom Boom and Pom Pom were among the biggest casualties, Boom Boom was battered and Pom Pom was badly bruised, the Koopalings called for an ambulance. At the hospital, Boom Boom gradually recovered from his injuries, but Pom Pom did not pull through. She died, along with tons of other victims.

Bowser and the surviving minions held a funeral at Bowser's castle, Boom Boom was the most devasted of all and he went into spiraling depression, staying in his headquarters and watching sad television and eating nothing but ice cream all day and all night, every day after that.

3 days later, Boom Boom's hands and arms were slowly shrinking and weakening and his stomach was bloated, the Koopalings were giving him some alone time out of respect, but Wendy could not stand to see him miserable any longer. She went to him and asked, "You doing ok?"

Boom Boom grumbled, "Leave me alone."

"Look, I know you're upset over losing her, but you can't just coop up in here forever."

"I can try."

"Come on, get some fresh air, Pom Pom would have wanted you to move on."

"I just can't."

"If you don't, you'll eventually die."

"I'll take my chances."

Wendy sighed in exasperation and left. Hours later, she brought him his dinner, but Boom Boom said, "I don't want it."

"Will you please-"

Boom Boom irritably snatched the food and threw it at her, "I said I don't want it! God!"

Wendy looked like she going to blow a fuse, but then she stopped and calmly said, "I think I know what'll cheer you up."

"What are you talking about?"