Dana Zane
The end of the world.
((here this explains why it's called infinite forest. "An infinity of possible worlds, so perfectly simulated as to be indistinguishable from the experiences I once called “reality.” I can touch them, taste them, pass lifetimes in them! They grow within this machine like fruit upon a tree — no, a forest of trees, its fractal expansion nigh unmeasurable. (...) What an awful, destructive machine this is. I must know everything about it." ))(the forest with the energy signal the Doctor tracked and now he's super excited he's never seen something like this before.)