Dawn's sudden appearance is suddenly explained.

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Sources:

Greenwalt, David, and Joss Whedon. “Ted.” Buffy the Vampire Slayer, created by Joss Whedon, season 2, episode 11, The WB, 1997.

Petrie, Douglas. “No Place Like Home.” Buffy the Vampire Slayer, created by Joss Whedon, season 5, episode 5, The WB, 2000.