This isn't a crossover. I don't own the Teen Titans or any comics based on Injustice Society.
It's nighttime in Steel City as a speedboat being driven by male figure that looks like he is in his teens is heading to the main headquarters of Titans East. He parks the boat at the left side of headquarters where an air vent can be seen. He puts a pair of gloves then proceeds to climb up to the vent. Once up there he notices the vent is very narrow not fitted for any person to go through. But it didn't seem to be a problem for him as he opens it going inside.
He jumps down from the vent where he is in the basement. Approaching to a power generator, the male teenage figure places a metal disc that automatically activates.
Outside of Steel City; three female figures and another male figure all look like they are in their teens are seen near Titans East headquarter. A female figure is holding an object in her hand which looks like a mobile phone of some kind answers it when it suddenly rings.
"I'm in and I placed the device" a male voice tells the female figure over the phone.
After talking to him over the phone, she looks to the other figures telling them "you all know what to do."
They all nod with one another agreeing of what she tells them.
Inside the headquarters; Aqualad is in the gym doing swimming laps by the pool. After doing about twenty laps, he gets out of the pool to climb up the ladder to the diving board. Aqualad does a successful somersault tuck position dive in the water. He looks up to see an individual in what looks like a combination of light blue and dark blue waving at Aqualad. He becomes alert suspecting the individual might be an intruder tries to get out of pool. But it is too late as the pool suddenly freezes with Aqualad in the water. It turns out the individual is a male teen who leaves the gym.
Speedy is in his room assembling his arrows. After finishing the last one, someone knocks on his door. "Come in" the archer says but no one opens the door.
Someone knocks on the door again which makes Speedy annoyed. "I said come in" he says and again no one opens the door.
"It better not be those Spanish talking' morons" Speedy says as he leaves his room. He at the hallway looking for what he suspects is Mas y Menos but sees no one.
"I'm not in a mood for you antics" Speedy mutters. He doesn't want waste anymore time for them to pop out so Speedy heads back inside his room. He sits back on the chair about to fix his hair unaware that a female teen is seen standing in the shadows. With comb in hand, Speedy looks at the mirror but notices a female teen in the shadows. He gets up from the chair turning to her only to get hit with an orange and black dart in the neck.
Speedy begins to feels drowsy trying to stay awake as the female teen approaches him. He tries to see her but only can see her holding a pipe in her hand before falling to the floor.
Mas y Menos are walking the hallway when one of them spots something on the floor.
"Que es eso" Menos asks.
The twin superheroes head to the object on the floor which turns to a pair of dice. Mas pick up the dice looking at when it starts to glow.
"De donde viene esto" Mas asks. The dice suddenly explodes sending Mas against the wall knocking him out.
"Mas" Menos says becoming worried heading to his unconscious twin brother.
"Necesito ayuda" Menos shouts but no one comes. A small pellet suddenly hits the floor engulfing Menos in a smoke screen. He gets attacked from behind by unknown figure knocking Menos out. The smoke slowly fades away showing the two teens standing near the fallen twin speedsters.
The male teen out his mobile device saying "they're down."
"I took care of Aqualad. He's a frozen fish stick" the male teen responds from the mobile device.
"Same here with Speedy" said a female teen from the mobile device.
"Good, the last one is mine" another female teen tells the others from the mobile device.
Bumblebee is walking the hallway to the direction where the gym is located. She enters inside asking "Aqualad, you're in…here?"
She at the pool to see the water is frozen and Aqualad is inside. "Aqualad" she shouts showing concern her teammate is encased in ice. She exits the gym heading to Speedy's room. Once she enters inside, Bumblebee finds the archer down with a dart next to him. She checks to see if Speedy is okay when she notices a shadow of a female figure. Bumblebee looks to see the female figure but she quickly runs away.
Bumblebee flies out of Speedy's room going after her shout "hey you stop right there."
She flies after her but stops to see Mas y Menos are down as well. "What's going on" Bumblebee asks. She hears a noise coming from the mission room. Bumblebee enters inside to see no one in here. Suddenly the lights go off in the mission room and the same female figure from before is near the doorway.
"I see the leader of Titans East is all alone" said the female figure.
Bumblebee turns to see her asks "you're the one who did this? Who are you?"
"A threat nothing more nothing less" she tells Bumblebee.
"How about you turn on the lights" Bumblebee asks getting into a fighting stance.
She laughs at Bumblebee telling her "well since ask so nicely."
The lights turn on reveals the female figure. She is a teenage girl wearing a costume quite similar to a well known enemy to the Teen Titans. She has medium white hair and two katanas on her back.
Bumblebee is somewhat surprise by the says "you look like-"
"Slade" she interrupts taking out her dual katanas. She begins to attack Bumblebee but the leader of Titans East easily avoids her. Bumblebee uses her stingers shooting energy blast at the teen girl intruder but she performs a back flip.
"Are you related to Slade" Bumblebee asks.
The teen girl wearing Slade's costume responds by throwing several daggers at her but Bumblebee blast each one with ease.
"You're highly trained. If I had to guess…H.I.V.E. Academy" she says.
"So what did Slade trained you" Bumblebee asks aiming her stinger at the intruder.
"If you're so eager to know" she says placing her dual katana behind her back. She gets into a fighting telling Bumblebee "come find out."
Bumblebee drops her stingers into a fighting stance going after the teen girl. The leader of Titans East delivers punches and kicks but the intruder easily blocks each attack. Bumblebee tries to punch the teen girl but she quickly counters with a leg sweep. As she takes one of her katanas, Bumblebee grabs her stingers then uses her size alteration ability.
"Shrinking yourself into a tiny insect won't help you" she says to Bumblebee.
And she was right as Bumblebee uses her stinger to blast the teen girl but she uses her katana block it. The teen intruder is aware Bumblebee is flying around trying to energy blast her as she continues to block each one. Getting bored with the Bumblebee trying to blast her, the teen girl places her katana back in her case. And in quick seconds, she claps her hands together which catches Bumblebee knocking her out and returning to normal size.
With the leader of Titans East down, the teen girl who is wearing a costume also identical to Slade leaves the mission room where she joined by the same four teens who remain in the shadows.
Enjoy!