Imagine the Thirteen Doctor didn't regenerate as she planned. She just said Goodbye to Yaz and regenerates back into herself. But The TARDIS won't let the Doctor go back to protect Doctor and Yaz from more pain.
Imagine the Thirteen Doctor didn't regenerate as she planned. She just said Goodbye to Yaz and regenerates back into herself. But The TARDIS won't let the Doctor go back to protect Doctor and Yaz from more pain.