Three students were among several to have their minds captured and imprisoned in a super mind by an alien posing as a hologram in a smart phone app.
The Twelfth Doctor and Jata witnessed their capture before they tracked the alien down to his space station and freed his prisoners. The pair later returned to the girls to make sure they were alright, with the Doctor getting Jata to give one of them a free pony ride. (COMIC: Killer App)