Sometimes even Batman is thrilled by how awesome he is.(Panel from Batman #290 by David V. Reed and Mike Grell).
Bitch, calm down. First of all, she's a fictional character so any answer to the question "What happened?" is going to sound crazy. And secondly, let's have a look at this allegedly "bulky" and "sometimes even fat" heroine (from Lois Lane #111).

MOOOOOOOOOOOOOOOOO!!!!
Man, that sounds great! Let's have a look inside!
Jive talking?! Tandem motorcycling?! It can only be the Super Sons! Let's see what those crazy cats get up to this time.
Y'know, sometimes a hero will say 'clown' and mean it to be a derogatory description for a crook. But sometimes he actually means 'clown.'
So why were those clowns slapping you around, doll?
Once again I find myself momentarily forgetting that these are the sons of Superman and Batman, and not Superman and Batman proper. Because that would be really funny. As it is, I just hate these guys.
Man, Superman's son gives me the jeeblies.
I guess prisoners accept anything as entertainment.
Then Superman Jr comes down with a lightning-fast case of Gigantism, which ends when he gets bitten by a giant lizard. Cause, y'know. There was only one page left to wrap everything up on.
Batman's quote there is almost a haiku. A crazy, crazy haiku.
Luthor smiling and waving kills me. He's in good spirits for a man who just had a gun pointed at his back by his own daughter. "Bye-bye! See you when I get out of prison! Oh, Superman and Batman jrs, this will be a fun roadtrip back to Earth! I brought granola bars and Justin Timberlake!"
"Let's Rap!" says Superman, fooling no one.
We dig, Superman.
"Groovy?" Take another hit, you hippy!
Wait, I'm sorry. What was that?
Yup, wedged right in there between Pollution and Space Flights.
Costume/Appearance: It takes a real man to fight robots while wearing nothing but a very short shift dress and white go-go boots. I consider Magnus to be the great equalizer when it comes to comic book cheesecakery. There are so many ridiculous, impractical female superhero costumes out there, and yet this guy might have one of the silliest. And most blatantly sexual.
It's a very short skirt. And this comic offers consistent upskirt shots, something that is seldom seen in a male superhero comic. The truth is, Magnus should look ridiculous, but he doesn't. He's got a fantastic body, and he shows it off. Plus, he's got really nice features. Great hair, steely blue eyes, powerful eyebrows. He's an attractive guy.
Plus, I really like that belt with the big "M" on it.
10/10
Despite appearances, Magnus is a pretty macho guy. I mean, he spends most of his time fighting robots. And sexing his lady-friend, Leeja.
He seems like a nice guy, but can be kind of whiny. He's always saying he doesn't want to do one thing or another. He's conflicted about fighting robots sometimes, and he can be a little emo about his robot up-bringing. But generally, he's all man.
Dayjob: He fights robots.
Sexiness of Powers: Magnus has superhuman strength which allows him to destroy robots with his bare hands. That's pretty much it, but that ain't bad.
Cons: After issue #25 of the Valiant series, Magnus started wearing lame-looking armor when he fought robots. Booooo. I'm taking off a couple points for that decision.
I heart Magnus. His comics are like the Harlequin romance novels of comics. He puts on a little dress, fights some robots, flexes his muscles, maybe takes his top off, maybe makes out with someone, and you're done. Very easy to follow, and very easy on the eyes.
Batman takes time to do the little things:
Wait. That's the clock in the Batmobile?! It's a dial clock!
1. Don't daydream while driving the Batmobile, causing yourself to be nearly wrapped around a pole.
Doctor?! Doctor of what?! That does not look like proper medical treatment.
The world's two greatest escape artists? Awesome!

If I were the bad guy I would have taken an extra minute to remove Batman's belt as well. Anyway, this is all very awkward and embarrassing for Mr Miracle. He's not happy:
I love that. Batman's all, "Now just relax, Scott. What's your hurry? Let's try to make the most of a bad situation here..."
Mr Miracle busts out of that net, without clothing, and yells an awesome threat at the villain. And Batman...sits and swings like a market cheese.
And that, my friends, is why he's the World's Greatest Detective.
You shut your mouth, Batman! This is a Haney comic and it can and WILL work! Be gone with your scientific reasoning and pesky facts! There is no room for them here in Haneytown! I'll not have you spoiling my fun!
Bruce Wayne: father of the year.