A small summary for those nerds who have never seen the show :)
Steven Universe lives with the Crystal Gems: Garnet, Amethyst, and Pearl. Being half-Gem and half-human, Steven's mother, Rose Quartz aka Pink Diamond, sacrificed herself to give her son a true form, and to bridge the gap between humans and gems through his father, Greg Universe (Logically speaking how was he born did he do the deed?). Steven and The Gems live in this small town called Beach City, and together they protect their town from the Gems' planet Homeworld while Steven is training to master his powers to become a hero who fights for what is right.
Steven and The Gems have met Lapis when she tried drowning the earth.
Right now the Group is just chillin' on the couch playing video games and reading.
"I win again" Steven screamed while jumping up and down.
"Ugh, you must be cheating" Amethyst whined still looking at the TV screen that said YOU LOSE.
"You just need to get better, Unlike you, I am a pro" Steven bragged.
"Why you little sh-" Amethyst started before the phone rang.
"Hello?" Steven said.
"Hey, Steven it is me Connie," the person on the other end said.
"Hey Connie what is going on you sound worried?" Steven asked knowing Connie wasn't one to be worried about that often.
"Well me and my mom found something that looks like a spaceship," Connie said.
"What type of ship?" Garnet asked.
"A small pod with 4 colored diamonds on it and some writing," Connie said.
"A homeworld ship," Pearl said while covering her mouth,
"Where are you?" Garnet asked.
"Near the docking bay," Connie said.
"We will be there in ten minutes," Pearl said as she grabbed Amethyst and rushed out toward the bay.
~~~~~~10 minutes later~~~~~~~~~
"Hey Connie we are here," Steven said while waving at Connie.
"Hey Steven, there is the ship," Connie said while pointing to the spaceship.
"Yep that is a Homeworld spaceship," Garnet said as she observed the ship closer up.
"What does that writing say?" Steven asked while trying to understand the pictures on the front of the ship.
"It says WARNING CORRUPTED GEM DO NOT OPEN ORDER OF WHITE DIAMOND," Pearl said.
"You know it is bad when white Diamond puts out the order," Garnet says as she pulls out her fists.
"Well I wasn't going to open the door, I was going to cut it!" Amethyst screams as she slashes the door in half with her whip.
"Woah it is pretty small," Steven said while walking inside of the ship.
"Look at those paintings" Connie exclaims while pointing to a bunch of paintings with a black gem that has an x over it.
"Hey Garnet, what types of gems are there?" Steven
"There are many gems of many colors except ones," Garnet says while still walking.
"Hey look a gem," Connie says as she touches a bubble with a black gemstone in the center ship.
"Deactivating Gem Field," the ship says as the bubble covering the gem fades away.
"Connie get behind me!" Steven screams as he forms his gem shield.
A bright light formed around the gem as it began floating.
'Finally, I can reform it has been years since I was freed what form should I take?' The gem thought.
"What is happening?" Connie screams.
"The gem is forming," Garnet says.
'She will do' the gem thought as it began forming.
Once the light dimmed down the gem stood up and looked like a complete copy of Connie just without her glasses.
"She looks like you," Steven says as he begins walking closer to the gem.
"Huh?" The gem questioned as she backed away from Steven.
"You are scaring her," Connie states as she walks toward the gem.
"CONNIE!" Connie's mom screamed, scaring the poor gem.
"Eppp" She exclaims as she tries to escape.
"Get her," Garnet tells the gems.
"Oh no you don't, '' Amethyst says as she throws her whip catching the gem and dragging her to the ground.
"Now poof her" Steven screams.
"On it" Amethyst replies while pulling her whip tighter.
"No not again" the gem replies as black lightning escapes from her body and electrocutes Amethyst causing her to poof.
"Amethyst!" Pearl screams as she rushes in to attack with her spear.
"Please I don't want to hurt you" the gem tries explaining.
"You just poof one of my friends" Pearl screams while throwing her spear at the gem.
Suddenly a wall of black energy formed holding the spear intact. With that distraction, the gem rushes toward Pearl and poofs her.
"Pearl!" Garnet screams, readying to attack the gem.
"Wait Garnet the gem only attacked in self-defense she was scared," Connie explains.
"So maybe we can talk," Steven says
The gem walks and picks up both Pearl and Amethyst's gems and puts them in Steven's hand.
"I am ready to talk," the gem says and she sits on her knees.
"Hi I am Steven, who are you?" Steven asks.
"I don't know, I don't remember much." The gem says, rubbing the back of her head."Where am I?"
"You are on earth," Steven says.
"Earth? Is that a new gem refugee camp?" The gem asks while tilting her head.
"No"
"So you aren't with the diamonds?" Garnet asks.
"No, I was exiled and sent here by the diamonds," the gem says.
"Please can she come with us, Garnet?" Steven whines.
"Sigh, Sure but first she needs a name," Garnet says.
"How about Onyx because her gem looks like it," Connie says while pointing to the gem's Gemstone heart.
"Onyx? Like that name" Onyx says with a small smile forming.
"Let's go, this place is giving me the creeps," Garnet says while shivering.
"Hey Connie, would you like to help me give Onyx a tour of beach city?" Steven asks while holding his hand out to Connie.
"S-S-Sure I would love to," Connie says with a small blush forming over her face.