"This is my third face," Susan said, pointing to her face, "I wanted the Ponds to see this face just one more time."
"Wait just one moment," The Doctor said, "if we could power up the vortex manipulator with some of the regeneration energy, then it might work for one more trip. Give me it."
Susan tossed it over to him, he used the sonic screwdriver on it, and he tossed it back to her.
"Now when you regenerate it will take you to this date in 1967," He told her, "go into the TARDIS, it's safer."
"But I'll be sent back in time all alone," She said, "what am I supposed to do?"
"You'll find Barbara and Ian," He replied, "and besides, you're going to land on this exact date in the 1967, so I'll go back in time the day after you arrive."
"Alright," She sighed.
"You go to the TARDIS, I've got some dinner to eat," He said.
She sighed and went into the TARDIS as her grandfather went back into the Ponds house. Barbara and Ian don't know about regeneration, She thought, they won't recognize me. Her hands started glowing. This face didn't last very long. I'm nearly 400 and still hoping old friends will recognize me, She thought. The glow consumed her skin and hair.
"They wouldn't recognize me anyway," She murmured before the TARDIS was bathed in light. "Ahhhhhhhhhhhhhhhhhhhhhh."
She stumbled dizzily before falling over. Where am I? Then she realized the vortex manipulator worked. I need somewhere safe to stay while I'm still getting used to this new regeneration. I am alone, just regenerated, and in a new time. What am I supposed to do? She blinked and ran her tongue over her new teeth. New teeth are always strange. She stood up, stretched, and looked herself over. She was a teen, long curly brown hair, and blue eyes. She recognized where she was. It was where The Doctor had the TARDIS parked in 1963, but it the ship is long gone, since it's 1967.