User blog comment:Barry19/TDA S1 EP1 - The Keys to Infinity - Hints and Teasers 1!!!/@comment-24825392-20150624141939

Okay, so I have no clue whatsoever what any of that could be. However, I love writing short stories so this is what could happen based on the clues:

So the Doctor is at stonehenge (Where a woman tells him that he is late) and he leaves the stones alone. Then they suddenly come alive! The Doctor is busy fighting metaphorical spiders, that like watching Gravity Falls for no apparent reason, so the Doctor sends Captain. Jack. Jack encounters problems of the rocky kind and is eaten by them. The only way to defeat the stones is by placing all the keys in the middle of stonehenge. Luckily, the Doctor got two from the spiders (who are not actually spiders) and one was in an ancient stone. Once he gets there, he is on the brink of death and it turns out the rebellious Time Lords have set this all up. Torchwood swoops in and helps the old Doc. out. The Doctor gets all three and puts them in the middle. The End... or is it?

Hopefully I have read all the clues correctly and I now have just summarised the plot, but I doubt any of that was correct. XD