I didn't set out to get all Madcap's early appearances, but here we are.

Today, safety lessons your mom should've taught you! The definition of "'sponsible"! And how long it takes two super-powered children to realize someone's not right in the head, in 1988's Power Pack #34, "Child's Play" Written by Howard Mackie, art by Larry Alexander and Louis Williams, inks by Tony DeZuniga.

Katie, the youngest of the Power Pack, is bored out of her mind, and gets in trouble for trying to pull a practical joke on her older brother Jack. Meanwhile, at Four Freedoms Plaza, the visiting Franklin Richards is likewise bored, and gets in trouble for trying to pull a practical joke on the Human Torch, and nearly getting disintegrated in his father's lab. Franklin's age and power levels seem to vary wildly, but today he seemed younger than usual, and had the power to appear elsewhere in a "dream form," so he visits Katie. Together, they catch an episode of the Madcap Mystery Hour!

Presumably the show was public access, but I could see it catching on. Katie and Franklin decide Madcap would be a fun guy to hang out with, and with their powers they're able to find him for a visit. And Madcap's game for running around with super-powered children, since he's crazy. Madcap sticks his head in a garbage truck, squashing it and his hat flat, but both recover: Madcap has a healing factor, I'm not sure what the hat's excuse is...Madcap tells the kids the pursuit of fun is the only thing that matters, and gets them all sticks to play pirate. The kids point out their respective moms told them not to run with sticks, lest they poke an eye out, so naturally...

When Madcap turns his insanity power on the crowds, the kids have to try to keep anyone from getting hurt. Katie has to swipe a Porky Pig-like mask, to protect her identity, as Madcap interferes with a bank robbery. But the kids both learn responsibility...from the example of someone utterly without it.

I think there have been a few stories with an aged-up Power Pack: getting most of them up to tweenage, maybe? And Alex has shown up in Fantastic Four in recent years. Still, if this issue had been written today, it probably would've featured Deadpool in Madcap's role...even though there are probably laws in place to keep Pool away from kids.