All Creatures Great and Small

Authors note
Ever had the most insane idea ever and just had to write it? This is mine. I'm not telling you what the crossover is with you have to guess...

Disclaimer
I own non of the characters used in this story

Buffy lay on her back looking at nothing. Two weeks ago Willow left with Giles for England. Just her, Dawn and Xander were left of the once inseparable Scooby Gang. Dawn had passed all her classes this year. Xander was now a full blown foreman at the rebuild of the old Sunnydale high. Spike was long gone, who knows where and Buffy's job at the Double-meat palace was causing her more trouble than it paid.
All of this was nothing compared to last night. A slayer vision, the first in a long time. It was still a jumble of images and feelings. All Buffy could be sure of was something BIG and dark was coming. The only way to stop the dark was a light. That light was hidden in a mountain somewhere. As far as she could tell from the dream the mountain she had to find was once a volcano.
Pulling herself out of bed she went to the computer and looked for volcano's trying to find the one she had seen for that fleeting moment.

Dawn bounced down the stairs and into the kitchen, not noticing Buffy sleeping in front of the computer. She quickly burnt her breakfast and made herself some coffee. Walking through the dining room she finally saw Buffy slumped in her seat. Smiling she thought nothing of it and went to watch Saturday morning cartoons.
Just when she sat down she heard Buffy scream. Throwing her coffee all over the room Dawn scrambled off the floor and ran to her sister. Buffy was pail and shaking, looking at the computer screen. 'Buffy! Buffy what happened?'
'Dawn. He's coming! He has to be stopped.'
'Who's coming?' Dawn had never seen this wild look in her sisters eyes before 'Who?'
'I'm not sure. He's coming here. We have to stop Him somehow'
'Buffy, your not making sense. Did you just have a slayer dream?'
'Yes, no, I don't know. It felt different, like someone else was trying to tell me what was happening other than the usual "look out". Whatever it is the answer and perhaps the only hope we have is there, in Oregon.'
'Mount St. Hilary? A volcano?'
'I fell asleep when I saw this. We have to call Xander and get there.'
'All of us?'
'No just us three I don't want to interrupt Willow's retreat.'

Xander pulled the car up to a small motel just within the city. Shelling out for two rooms was the least of their troubles. Each time Buffy fell asleep she had a vision of what was coming. Now she was certain that there was something guiding her here and Xander was very worried about that. Dawns research, while they were on the road, said that there had been lots of big shadows and small areas of massive destruction all over the state. Mostly centred around power plants and natural energy resources. No one knew how or what caused it. The press said it was due to the experiments the power plants used and the plant workers said that storms and localised earthquakes were to blame
They stayed the night in the motel. In the morning they decided that Dawn would stay in the rooms and research more on the destruction while Buffy and himself drove around and tried to find whatever was calling to her.

Dawn was bored. No question about it. Five hours of research and all she had found was a police report saying that one of the eye witness was as nutty as a fruit cake and has been sent to the hospital. Zoning out in front of the T.V. she found a news report on another patch of wholesale destruction. Unable to find the strength to change the channel she let the words pass over her.
At that moment another thing passed over her, a blue, red and white military jet, closely following another jet. This one unlike anything in the armed forces. It's hammer-head shaped nose cone carried two guns. Behind that was a (relatively) thin cockpit, behind that a forward sweeping crescent with two jet engines underneath. This one was painted a mix of dark green and back. The blue and white plane fired twin laser cannons at the green craft. One burst flew wide but the other nailed its right engine. The craft smashed into the motel building, destroying most of it.
It was a miracle that Dawn wasn't hurt badly. She climbed out of the wreckage of her room to see the pilot of the green plane pull himself out of the wreckage. He was dressed in a strange steel suit. Dawn helped him up. 'Thank you young lady, now please run before Starscream comes back around.' Dawn was about to ask what was happening when the blue white and read jet flew over and fell apart.
For a moment Dawn thought it had exploded and dove for the ground but the was no sound. Rolling on her back she saw a giant man shaped thing, that was made from plane parts, point some sort of barrel that was attached to its arm. 'Surrender the prototype or I will vaporise the fleshling!' It's high pitched voice was almost gloating.
'Don't.' Dawn looked straight into the giants eyes while she stood up
The man in the metal suit stopped and looked at her 'What do you mean don't? Young lady you don't even know what's happening. If I don't do as he says he will kill you!'
'If this cowered is willing to shoot me to get you to give something up then it's pretty simple who the bad guy is. Whatever it is he wants must be important for him to chase you and then threaten me. Besides that thing will kill me even if you give him what he wants.' Dawn still looked in his eyes she saw the same thing she saw in all those daemons who had kidnapped her. She knew she was right.
'It matters not! I will take the prototype from your broken shell' he swung his arm around pointing it towards the man in the suit. A purple beam of light shot out. Dawn tackled him, pushing him out of the way. She, however, wasn't fast enough to save herself and saw the blast clip her right leg just above the knee.
For a second a crippling pain flashed though her, every part of her was in agony. Somehow she was stayed awake thru the pain. Unable to move she watched the big robot gloat. The green and black plane suddenly another robot, this one with out a head. The pilot jumped into the air folding up in away no man ever could landing on top of the robot he had become it's head. As the two came together the first robot stepped back. The green guy planted a right hook on the others jaw sending it flying almost half a mile.
Dawn was fighting the grey fuss that clawed at the edge of her vision as the green robot picked her up and flew away. Despite her efforts the fuss was winning, unable to feel he own body she did not give up. As her eyes drifted shut she still fought for life.

End chapter 1