Protectors of Sol III
(A/N: I don't claim to be a screenwriter by any stretch of the imagination but the story can essentially be told via dialogue. Since "Earth" and "Midgard" are used in this story, "Sol III" it is.)
Setting the stage: The TARDIS appears background stage left. We see RORY inside, peeking through the narrowly-opened door. THE DOCTOR (4th) is in front of the TARDIS left door, sitting on the ground with his legs crossed, his hands resting on his knees. In front of the Doctor is a Dalek, aiming its eyestalk so it can observe both the Doctor and Rory. Background stage right is the Nordic God THOR ODINSSON, poised with Mjollnir to strike the Dalek.
Dalek: You are the Doctor. You are the enemy of the Daleks. You will be exterminated. (Directs its energy weapon toward the Doctor.)
Doctor (holding up his right hand): You may want to reconsider your situation, Dalek. We are on Earth and I'm its protector, you should know that by now. But you're out of luck this time. There's another protector of Earth, or Midgard as he calls it, whom you haven't met.
Dalek: Irrelevant. He will also be exterminated.
Thor: Ahem.
Dalek (turning at the sound): You are the protector of Sol III?
Thor: Of Midard, yes. Thor Odinsson, Crown Prince of Asgaard.
Dalek (looking up and down Thor, assessing this new foe): You appear to be harmless. You will be exterminated before being able to provide the Doctor with any assistance.
Thor Smirks. The Dalek's electrical energy weapon discharges on Thor's chest.
Dalek: You appear remarkably unharmed.
Thor: Try again. (another shot) That tickles, try again. (another shot)
Dalek: This is futile. Obviously you are able to resist the might of one Dalek. You will not be so fortunate with a platoon of Daleks. (More Daleks move in.)
Thor (to the lined-up Daleks): Okay, have a go, then I'll destroy you all for being a threat to Midard. I should advise you that I harness the energies of lightning like a farmer harnesses a mule. And none can resist Mjollnir (waves his huge war hammer around.)
Doctor: Uh, a moment Thor. Maybe leave one so he can go tell his fellows to leave Earth alone ad infinitum?
Thor: All right, which will be the lucky survivor to warn the others. Hmmm... I'll choose you. Now stay still whilst I massacre the lot of you. (Proceeds to smash the Daleks into much-needed sewer covers.)
Doctor (after the massacre minus one is over): Now go tell your emporer Davros that Earth, or Sol III, or Midgard is safe in perpuity and if he doesn't believe me, run that video of this 'fight' over and over till he gets the clue. Run alon- I mean away - now, there's a good lad.