"What makes a hero? Courage? Powers? These are the questions that would be asked about those unlikely few who have stood against the greatest threats this world has ever faced. Conflict, as the armies of Darkseid and Thanos swept over the earth. As the world's forces tattered on the brink of destruction, a new hope arose, an elite international team of heroes, their mission, to end the war, push back the invaders and restore liberty and freedom to all nations.
The Justice Force: legends, gods, adventurers, earth's mightiest heroes." 
"Who fought for truth, honour and justice for a generation. Under their watch the world recovered and today even though the age of heroes has ended they will never be forgotten."
"And that concludes our history lesson for today, class" Principal Celestia said, when the documentary have finished.
The school bell rang, signalling the end of the school day.
The CHS Main Seven along with Starlight Glimmer, Princess Twilight's student from Equestria, walked home all together. 
"Can you believe the JSA weren't the only team of heroes?" Rainbow Dash, exclaimed "there was an amy of heroes,"
"It certainly a lot to take in," Sunset nodded.
"I think the best bit was their fabulous costumes," Rarity noted.
"It's kind of overwhelming, when you think about it," Fluttershy continued.
"Some heroes don't even have powers just look at Batman," Pinkie added.
"Who?" Starlight asked.
"Batman," Pinkie replied, "you know the Dark Knight, The Caped Curseder."
"Nope, sorry." Starlight answered.
"He's the hero I was assigned to research for homework." Pinkie retorted.
"Right, we were all assigned different heroes to research." Twilight confirmed, "I got Mister Miracle, one of the smartest beings on earth."
"I got Captain America," Applejack carried on, "the sentinel of liberty."
"I got Flash," Rainbow Dash continued, "the scarlet speedster."
"I got Thor," Rarity continued, "the Goddess of Thunder."
"I got Supergirl," Fluttershy continued, "the girl of steel."
"I got Captain Marvel," Sunset continued, "the hard hitting, high flying Avenger."
"and got some guy call Aquaman," Starlight finished, "what kind of hero fights with water and can talk to fish?"
Soon the girls went their separate way to their homes, Starlight going with Sunset as the two shared a house.
"I wonder where those heroes are now?" Sunset pondered, in her head.
The City of Metropolis.
"Nice evening," Lois Lane remarked.
She noticed her husband Clerk Kent, a.k.a. Superman. 
Out on the balcony of their apartment, looking out at the city and the busy streets.
"You OK?" Lois asked, as she joined on the balcony.
"Yeah," Clerk replied, "I just miss the old days when..." he sighed.
Lois smiled, she understood, "I know," she said.
"You talked with Kara or Conner?" she asked.
"Kara's got too much work since she was promoted to Kat Grant's personnel assistant so she hasn't had time to talk," Clerk replied, "and Conner hasn't left the farm since pa died."
"The change hit him pretty hard," Lois remarked, "working on the farm was the only way he know he could leave the government behind."
Clerk was about to answered, his head snapped up, one of his many powers was super-hearing, he could hear the sound of someone crying for help.
"I know you want to help," Lois said, putting a hand on Clerk's arm, "but you know what happens if you do."
"Yeah," Clerk replied, "I just hate standing by and doing nothing."
New York, Stark Tower
"Anything to report, Friday?" Tony Stark asked, his building's AI system, Friday.
"Nothing, boss," Friday replied, "just a robbery in progress, police are on their way."
Tony sighed and poured himself a drink, sat down and looked sadly at one of Iron Man armours.
Back with the girls
Twilight was in her room, on her laptop, searching up her assigned hero finding out Mister Miracle's backstory and powers.
After she had finished, she remembered what Hal Jordan from the other universe had said, that he was from an alternate universe.
"I wonder," she thought, she typed down Hal Jordan's name into the search engine. She hit search button and gasped.
Central City.
Barry Allen a.k.a. The Flash, looked out at the city from his home.
"How are you doing?" his best friend Cisco Ramon a.k.a. Vibe asked.
"Oh, hey, Cisco," Barry replied, "you know me, I'm fine."
"Yeah, your not a very lier, Barry" Cisco replied.
"Sorry, Cisco," Barry responded, "I was just thinking about the days of The Flash."
"I know, Barry," Cisco nodded, "I miss my hero days too, so does Wally and Jesse."
Both of them sighed.
An ally way.
"Please, please don't hurt me," Lazlo Valentin a.k.a. Professor Pyg pleased.
"Lazlo Valentin, your soul is stain my the blood of the innocent," Ghost Rider a.k.a. Johnny Blaze said, holding the thug up against the wall.
Ghost Rider was about to perform his Penance Stare.
Suddenly a chain shot out of nowhere, "What the....?" was all Ghost Rider could say, as the chin hit him and making him let Professor Pyg go.
Ghost Rider turned to where the chain had come from, the owner of the chain dropped down into the ally.
It was anti-hero Spawn a.k.a. Al Simmonds, The demon-warrior who conquered Hell itself.
"Stand aside bud," he ordered, "this one's mine,"
"You have no business here, hellspawn," Ghost Rider replied, "the guilty must be pay for their crimes."
Before, ether of them could continue, they noticed Professor Pyg trying to escape.
"You don't get off that easy," Spawn said, he his cape moving, as if it were alive, wrapping itself around Professor Pyg's leg and dragging him back towards Spawn.
Spawn was about to kill the villain, before Ghost Rider interrupted him. Lunching his chains at Spawn, coursing him to drop Professor Pyg, letting him slip away.
"I told you before," Ghost Rider snarled, "you have no business here, hellspawn."
"I don't take orders," Spawn growled, "especially from creeps like you."
Both Spawn and Ghost charged at each other.
Back with the girls
Everyone was in bed and asleep.
Twilight had to let her friends know what she had discovered.