Students (Killer App)
From Tardis Wiki, the free Doctor Who reference
Three female 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 Jeta 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 Jeta to give one of them a free pony ride. (COMIC: Killer App)
