A filly-bot prototype built by Mr. Horse, Sugar Song is the best robot a pony could have. That is until her owner, Dusk Flare’s mother, perished when the megaspells fell in Equestria and the Crystal Empire, leaving her broken and useless in her devasted home. Sugar Song no longer has any purpose until the person she hates most, Dusk Flare, reappears and fixes her. Torn between her feelings and programming, Sugar constantly fights the desire to kill her current owner Dusk Flare.