Nick Abadzis 
Doctor Who [PDF ebook] 
The Tenth Doctor Year Three #11

Future ghost Gabby has been revealed as the Vortex Butterfly! The Doctor finally came face to face with the entity that had been intriguing him for so long… but he had to destroy this potential future version of his beloved companion when she threatened the lives of present Gabby, Cindy, and Sarah Jane Smith. Realizing that this manifestation sprung for Gabby’s block transfer abilities, the Doctor enlisted the help of old friend Zhe to help Gabby learn to control her powers…