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A purple-skinned alien posed as a holographic genie in a smart phone app in order to steal and enslave human minds in order to power his super mind, an app more powerful than any computer, to make him the richest man in the galaxy.
The Twelfth Doctor and Jata managed to track him down to his space station and free the enslaved minds, while tricking the alien into getting his own mind trapped in there in the process. After leaving him in there for a while to learn his lesson, the Doctor punished him by putting him to work advertising free pony rides. (COMIC: Killer App)
The Doctor Who Adventures story, Killer App, chronicled this encounter. (PROSE: Dear Readers)