There is no question that the San Diego Comic-Con (SDCC) is a huge event where fans get to be up close and personal with the stars. However, it is not unusual for the celebrities to meet their fellow actors. Actor Clark Gregg, who portrays Agent Coulson in 'Agents of S.H.I.E.L.D,' recently posted a selfie with the legendary Mike Tyson and the photo immediately went viral.

'Game of Thrones' star Maisie Williams also attended Comic-Con, and took an epic picture that unites three fantasy series in just one photograph.

Williams, who plays Arya Stark in the hit HBO show, met Daniel Radcliffe at SDCC and posted a picture on Instagram. The star of the 'Harry Potter' film series had a full beard and looked very grown up in their photo.

The picture also featured Williams' costar Hannah Murray, who portrays Gilly in 'Game of Thrones.' Jenna Coleman, who appears in the fantasy series 'Doctor Who,' is seen smiling in the picture as well.

Williams had a funny caption for the photograph. "I think this photo is gonna make the world implode..... Last night was really great #sdcc2015," she wrote.

Arya Stark is one of the most well-known characters in George R.R. Martin's book 'A Song of Ice and Fire.' In the season finale of 'Game of Thrones,' Arya breaks one of the rules of the House of Black and White and ends up losing her eyesight.

Williams has previously worked with Jenna Coleman in the upcoming season of Doctor Who, where she will play a mysterious character from the Time Lord's past. Coleman, who plays Clara in the series, recently offered a hint on the relationship between Williams' character and the rest of the cast.

It's a very surprising and intriguing storyline with her connection to us and her connection to the Doctor," Coleman said.