B.J wandered around the TARDIS and found a library. She went inside and read some books to pass the time. One book held music and she found a music box to play a disc with what she thought was a rock band.

"I cannot hide, what's on my mind

I feel it burning deep inside.

The passion crime to take what's mine

Let us start living for today

Never gonna change my mind, we can leave it all behind.

Nothing's gonna stop us now, no not this time

So take your empty hand in mine

It's ours tonight

This is a rebel love song

Hearts will sacrifice it's do or die

This is a rebel love song!"

B.J smiled and hummed along to it. Unaware of what just entered the TARDIS and was getting closer. Doctor and Bucky got back to the TARDIS in time just to see B.J singing and fighting back a siren. "Cause it's the end and I'm not afraid, I'm not afraid to die." she sung before back kicking it unconscious. Bucky and Doctor shared a look. Doctor went to stop the music box and placed the disc back in the book. "I only got this for a collection. Not much into the metal type." he said placing the book back. "I like it. The lead singer looks cute, but so do all of them." B.J beamed as she hog tied the siren and gagging it with a bandana she found. Bucky rolled his eyes and picked her up. "What if whatever's happening is related to the sirens?" Bucky asked. Doctor hummed and whirred his screwdriver. "These sirens belong in another planet. That would be a likely possibility." he said looking at the siren. B.J was humming another Black Veil Brides song while she sat on a log outside. "Well, I guess it's because of you that she likes the metal genre." Bucky congratulated. B.J wanted to investigate the siren issue and silently left. "Yes, and this is the day she teaches herself a new style of being a spy. She calls it ghosting and she is the first ghost soldier." Doctor said pointing to a wandering little B.J. Bucky sighed and went to carry her back to where the Doctor was. "I'm used to teenagers." he said holding the nine-year-old in his arms. Doctor gave him a sympathetic smile. "What?" B.J asked. Bucky shook his head and sighed as he sat down on the log. "Perhaps we could go back to the town and ask about the sirens." Doctor said as Bucky unconsciously braided B.J's hair. Doctor didn't stop him because the girl looked like she was enjoying that. "Sounds like a good idea. Come on, kiddo." Bucky said carrying her and following the Doctor. B.J smiled because she was going to help and be a hero like those she looked up to. They asked around and were taken to an ancient temple, unused and covered in odd vines with berries. Doctor hummed and went into the temple. The structure was humid and they could smell water inside. Soft singing was heard and Bucky made sure he had a tight grip on B.J. Doctor saw the sirens sing with a queen. "Doctor, what is that?" B.J whispered, seeing the group. Doctor looked for ways to get out of there and all the sirens freed. The captured children were being formed into new sirens, a process irreversible. The queen looked at them and saw B.J. It sung towards her and Bucky backed away with B.J squirming in his arms. Doctor took his screwdriver out and made a shrill noise, disorienting the sirens for Bucky to get the kids freed. B.J was coherent and helped free the kids. Doctor felt brave and went towards the queen, who was screeching like a bloody murder. "Let's go!" Bucky shouted as he picked up B.J. Doctor ran after them and they ran to the TARDIS. The queen still went after them with her pack behind her. Their song was loud and it drove B.J made with wanting to follow it as if it was an ice cream man with his truck. Bucky had a gun in the waist band of his pants and took it out, cocking the hammer back and taking the safety off in one swift movement. He carefully took aim before stopping and fired a couple rounds at the queen siren.

Doctor heard the gun and knew it had to be done. The queen screeched loudly as she saw her children fall with lead in their heads. The queen grew furious and chased at Bucky, a feeling to want him suffer. B.J covered her ears from the song and the scream, pain was ringing her head. The queen had a king, he was bigger and his pack prey on adults. He crashed down and sung his song. "Great, now what?" Bucky asked, trying to avoid the song. Doctor pulled out his screwdriver and the loud frequency was made once again. It stunned the king and queen siren and allowed the three to run ahead. B.J wiggled out and ran. They got to the TARDIS and hid there while the two siren prowled outside. "I have an idea." B.J ran to the library. She grabbed some CD's and the music box, hoping that diluting the song would hurt the sirens. "Diluting the song wouldn't help much. We need a frequency to hit them with." Doctor said while B.J put a disc in the music box. The song played and it did confuse the large sirens outside. "Have anything we can shoot them with?" B.J asked. Doctor explained why he doesn't like guns very vaguely. "We could take them to their home planet." Doctor thought looking out the open doors. B.J saw where this was going and went out to the beasts. "That what you want?" she asked. The king tilted his head and looked at his queen. "Your home planet." she specified. The queen nodded and got slightly closer to B.J. Bucky ran out and brandished a knife and got in between. The queen hissed and looked ready to skin Bucky alive. "Papa, it's okay. They just want to go home." B.J said holding her hand out to the queen. The queen gently sniffed the hand and slowly when in the TARDIS behind her king. Bucky and B.J went inside and the Doctor smiled big. "So, I've never encountered your species first hand like this, so I don't know which planet you're from. Look at this map and tell me where you're from." Doctor said pointing to a panel.