Solar System: A Sherlock and Doctor Who Crossover

Planet Mars

Sherlock's face was nearly split in half with a smile.  "I can't believe any of this!  This is so amazing!  Where else can we go?  When else can we go?" 

The Doctor smiled at Sherlock's enthusiasm.  He had nearly exploded with questions, now that he was filled to the brim with nervous excitement.  The Doctor needed to fill that curiosity with even more knowledge.  "Well, we can go anywhere in this magic blue box..."

"Don't tell me it's magic, I know it's just science," Sherlock waved off his question, runnng his hands across the control panel.

"Don't touch that, it's quite sensitive, any amount of pressure could set it off," the Doctor grabbed Sherlock's hands and placed them down by his side.  "And, if you're so excited to learn more, we could potentially go anywhere."

Sherlock's face lit up.  "Anywhere?  So you can go backwards in time, too?"

The Doctor laughed.  "Of course we can!  But I was thinking that we could go to somewhere in space, since you're not doing too well with space science.  But I'll tell you what; if you promise me that you'll pay close attention to my lessons about the solar system and do much better in space science than you're doing now, I'll take you anywhere you want.  Where ever and when ever."

Sherlock practically jumped up and down and clapped his hands together with delight.  The Doctor smiled with delight.  He loved making people, especially little kids, happy, and he especially loved seeing this little boy so enthusiastic about travelling, even if it wasn't because he wanted to learn about the planets in his solar system.

"Let's get started then!" the Doctor wasted no time with any more bantering, which he seemed to do a lot, and slammed his fingers onto the apparently sensitive control panel of the mysterious blue box.  With an awful wheezing sound, the TARDIS kicked itself to life and threw Sherlock to the ground.  This time, the little boy laughed and felt his heart filling with joy.

 When the room finally came to a halt, Sherlock hestitatingly pulled himself to his feet.  "Where are we?" he asked, running towards the door.

"Planet Mars, about two hundred years in the future," the Doctor smiled.  Sherlock reached his hand out to open the door, but the Doctor slapped his hand away.

"What?  Doctor, why can't we go outside?"

"I think your excitement blinded you, since you're obviously not thinking straight," the Doctor smiled a very wide smile and playfully flicked Sherlock in the head, "You're forgetting that the oxygen bubble covering the TARDIS only extends a few feet.  We can't go out into the middle of a different planet without being prepared first."

 With that, he proceeded to disappear down a turn, leaving Sherlock alone to wonder what was happening.  After a few crashes, several cries of "Ow!", and several feathers floating through the air from behind the corner, the Doctor reappeared with two bright orange suits under his arm.  "Shall we?" he asked, jokingly holding out his arm towards Sherlock.

The Doctor helped Sherlock into his suit.  It was much too big for such a tiny little boy, but by rolling up the sleeves and the pant legs, the two of them made it work.  After putting on boots and throwing a helmet onto his head, Sherlock was ready to go out onto the planet.  The Doctor pulled on his suit, and turned to Sherlock with a gigantic grin on his face.  "Let's go explore."

Sherlock bounded out of the TARDIS faster than a kid running into a candy store.  The Doctor chuckled at his enthusiasm, then started to jog after him.  Sherlock gasped as he caught a glimpse of the world around him.  "Whoa..." he whispered, turning circles with his arms outstretched and his face pointed up to the sky with wonder.

"Isn't it amazing?" the Doctor knelt down beside his companion and patted him on the shoulder.  Sherlock stood, dumbstruck, staring at the world around him.

It was completely different.  In his world, there were buildings and the floor was either brown or green or grey.  Here, the ground was red, and the only thing he could see for miles and miles was red sand and boulders.  The ground was rocky, and the gravity was much less than the gravity on Earth.  With a laugh, he bounded off, leaping around and doing flips and having fun.

The Doctor stood there, smiling a soft smile at the sight in front of him.  He knew that at some point, he was going to have to say goodbye to this little boy and never see him again, but for the moment, he was happy to see the joy light up on his face.