'Game of Thrones' star Maisie Williams posted the ultimate fan selfie at Comic-Con

Some of the biggest stars of TV and big screen were roaming around this past week's San Diego Comic-Con.

And, it's expected that they'll combine in certain ways when they happen to be at the same place at the same time. But once in a while, fans hit the real jackpot.

This happened on Sunday - the last day of the convention - when Maisie Williams, who plays the brave Arya Stark on HBO's "Game of Thrones," posted a group selfie on instagram that just blew fans' minds.

Not only was Williams joined by "GOT" co-star Hannah Murray, who plays Gilly, but to Murray's right was Jenna Coleman - the current "Doctor Who" companion - and to her right... "Harry Potter" star Daniel Radcliffe!

Let the screams begin:

 Williams knew what she was doing. She wrote, "I think this photo is gonna make the world implode....."

She was right. The photo currently has 106,000 likes.