Originally Posted by Brass Drag0n:
“Though "The Name of the Doctor" does screw up the GI's timeline somewhat.
Battles 11 in 19th century London - motive: take over the world.
Battles 2 in 20th century Tibet - motive: take over the world.
Battles 2 (again) in late 20th century London - motive: take over the world.
Battles 11 (again) in 21st century London - motive: take over the world.
Battles 11 (final time) in 19th century London + Trenzalore (time unknown) - motive: kill the Doctor
So was the GI a time traveller before entering the Doctor's time stream or are we back to lazy writing?
And, of course, the "Simeon" personna was absent from the 2nd Doctor's adventures.”
Never seen the story but from what I've read the GI was around for 100's of years in Tibet before the start of the story set there.
This of course predates "The Snowmen" where it's implied the Intelligence first arrives on Earth (snowflakes traveling through Space).
It could be explained by the two 2nd Doctor encounters being from after the GI enters the Doctors Timestream however the GI of "Bells of St John" seems to be aware of these encounters (at least The Web of Fear) as he talks about UNIT and the Doctor being old friends.
Another explanation is that different parts of the GI arrive on Earth at different times with some landing in Tibet in the 1600's, some in England in 1840 (or whatever year it was that young Simeon met it) and some arriving in 1890.