Jo previously returned in 2010's Death of the Doctor, allying with Sarah Jane to save the Eleventh Doctor (c) BBC Studos
Jo and Sarah Jane in the Eleventh Doctor's TARDIS!, Death of the Doctor
Sarah Jane Adventures - Question : r/doctorwho
Jo Jones, The Sarah Jane Adventures Wiki
Did the Doctor Forget Jo?, Death of the Doctor
Jo Sarah Jane Eleven - Blogtor Who
Jo Grant - Wikipedia
The Eleventh Doctor Meets Sarah Jane!, Death of the Doctor
The Eleventh Doctor returns to audio - News - Big Finish
The Sarah Jane Adventures Whatever Happened to Sarah Jane?: Part One (TV Episode 2007) - IMDb
BIG FINISH EXCLUSIVE: Two New Series Doctor Who - Short Trips announced - Blogtor Who
Matt Smith in Death Of The Doctor - Blogtor Who