User:SOTO/Forum Archive/The Reference Desk/@comment-72.241.208.125-20130313210047/@comment-26975268-20130314222631
From Tardis Wiki, the free Doctor Who reference
I think it's meant to be Tim being inserted into the Doctor's memories, in his place. But, to answer the question, the flash doesn't come from any episode and, as CzechOut said, was made specifically for the episode.
