A/N: Thanks for all the feedback guys! I had to adjust Beast Boy's backstory from Young Justice to fit the Teen Titans universe, so you'll notice some differences.
"Your sister?" Robin exclaimed.
"Well, I can see the family resemblance," Cyborg quipped, indicating their shared complexion.
Starfire gave Beast Boy a cursory glance. "You are...not human?"
Beast Boy shook his head, waving his hands dismissively. "No, whoa, back up. I'm not an alien, but she is. We need to get her to the medical room back at the Tower, ASAP."
Robin interjected hesitantly. "You sure about that, Beast Boy? If she does have hostile intentions, bringing her to the Tower is the last thing we should—"
"I'm sure!" Beast Boy snapped.
"Whoa, green bean," Cyborg said, raising his hands. "No need to get all worked up about it. Can't blame Robin for having questions. Everybody here does."
Beast Boy relaxed. "We can talk more once we make sure she's okay," he said.
Robin nodded and Raven wrapped them all in darkness, where they arrived in the Tower's medical room.
Cyborg helped Beast Boy gently raise the Martian from the floor up onto a bed. Cyborg checked the computer readout hooked up to the bed. "I'm performing a medical scan...Doesn't look like she suffered much more beyond a mild concussion. We should still monitor her closely for any signs of severe damage, but she should regain consciousness soon."
"All right," Robin said, folding his arms. "In the meantime, I want some answers. You said this girl is your sister, but you're not biologically related? How do you know her?"
Beast Boy rubbed the back of his head."Well, she's the reason I have my powers. It happened before the Doom Patrol took me in. My mom was a scientist working for the Justice League at a private lab in Africa. There was an explosion, and by the time the Justice League found out and sent Megan and a couple others to help, my mom was dead." He looked away. "I'd lost a lot of blood, and because I'm O-negative, Megan had to use her shifting abilities to provide enough blood for a successful transfusion. Side effect, I went green, permanently, and was able to turn into animals."
"And after that?" Robin pressed.
Beast Boy shifted uncomfortably and sat at the Martian's bedside. "Well, before I joined the Doom Patrol, Megan took care of me. She helped me understand my powers. She was there," he put simply, and went silent.
They all turned toward the motionless figure on the bed.
"She'll be all right, BB," Cyborg assured him. "It wasn't a serious concussion."
"Yeah," Beast Boy said, but still looked worn.
Cyborg shook his head. "Sometimes I forget just how much we don't know about each other," he murmured to Robin.
"It's a matter of privacy. I don't want anyone to feel obligated to share their entire life story if they don't want to," Robin answered in a similar low tone.
"Yeah, well I don't really think BB wanted to just now," Cyborg huffed.
"I don't like nosing around where I shouldn't either," Robin agreed, "but for the safety of this team and the city I had to know who this girl was."
Cyborg didn't seem willing to accept this reasoning but moved on, checking the girl's vitals again. "Hey, looks like she's coming out of it," he announced.
The Martian groaned, opening her eyes. She registered that she was being held in an unfamiliar room and sprung into a seated position, hands becoming fists and eyes glowing a vibrant light blue.
"Who are you, and what do you—" She broke off when she spotted a familiar face. "Gar?" she cried. "Is that you?"
Beast Boy smiled back shyly. "Hi, Megan," he started, but was suddenly tackled by the Martian.
"It's so good to see you!" she said, hugging him tightly. "It's been ages!"
"Yeah," Beast Boy said as she pulled away to survey the rest of the group.
"Well, this isn't the Doom Patrol I know," she observed. "Either they expanded, or you joined a new team."
Robin extended a hand. "We're the Teen Titans," he greeted. "I'm Robin, and this is Starfire, Cyborg, and Raven."
Megan smiled at them. "Nice to meet all of you."
"You're not mad I left the Doom Patrol?" Beast Boy said, surprised.
Megan laughed. "We all grow up sometime, Gar. I branched off from the Justice League to form a band of super-teens, can't say I'm surprised to find you've done the same."
"Well, you're awful chipper for a lady that just survived a crash and almost destroyed half the city," Cyborg remarked, crossing his arms.
Megan frowned. "I did what? A crash?"
Cyborg shared the frown. "You must have suffered some temporary short-term memory loss from that concussion," he figured. "We'll fill you in, but you should get some rest."
Megan nodded. "All right. This crash: I'm guessing that's why I'm here? I was beginning to wonder." She moved back into bed, laying down. "I should be able to heal myself and restore my memories in a few minutes," she said, and her eyes glowed a powerful blue.
"Well," Cyborg said awkwardly, "all right then."
Robin looked over at the Martian distrustfully. "I wish it wasn't taking so long to get some answers," he said. "I want to know why she came here and if we should expect an attack."
"If there was to be an attack from more hostile forces, would they not have confronted us by now?" Starfire pointed out.
"I guess so," Robin admitted edgily. "But I still don't like this."
"Dude, relax," Beast Boy said. "Give her some time."
"Yes," Megan said, rising again. "I have all my memories back, and I intend to brief you on why I came here. My apologies for the crashlanding, someone set off a remote-controlled bomb in my ship as I was entering Earth's atmosphere. I was knocked unconscious by the blast and lost control of the ship."
"Who did that to you?" Raven asked.
Megan shook her head. "I'm not sure who they are. I've been posted in space for quite some time now; the enemies accumulate. I don't think I have been followed, however," she assured them.
"And why have you come here?" Robin demanded. "What do you want from us?"
Megan offered a small smile. "I did not intend to ask any of you for anything. I simply wanted to visit my little brother. Unfortunately our reunion didn't go as smoothly as I'd planned." She winced.
"And you're sure you feel fine?" Cyborg asked her. "That was a pretty intense crash."
"I'm much better," she laughed, "but your concern is appreciated. I am pretty hungry though. You guys have anything to eat?"
Beast Boy immediately jumped in with a suggestion. "Pizza!" he shouted. "Is it really a question?"
"He has a point," Cyborg admitted.
"Pizza it is then," Robin said with a smirk.
Megan shrugged. "Sounds cool to me."