Board Thread:The Panopticon/@comment-45314928-20200525010944/@comment-45314928-20200525195852

"Give reasoning that successfully rebuts the reasoning presented to you."

she travelled with the Doctor in the TARDIS (in Journey's End), together they helped save the world and piloted it back home. i dont think it matter in the slightest if it was a short adventure - in that moment she was a companion of the Doctor's.

"So bringing up a spinoff is not obvious cause to move her across categories."

as i have said, Kazran was upgraded for his appearance in an audio story (thus making him a multi-story companion) so i dont think it matters at all if it was a spin-off or not. and, while it may have been Sarah's show, she was still a companion of the Doctor in that episode (just like Jo / Sarah are on the Eleventh Doctor's list because of Death of the Doctor). and once again travelled in the TARDIS with him.