Granted; the time-travelling robot goes back to France in 1878 and kills Eadweard Muybridge - let's say, with a flamethrower - before he can make his first film, 'The Horse in Motion'. It then takes several jumps forward in time and kills Étienne-Jules Marey, Georges Demen˙, Albert Londe, Ottomar Anschütz, Émile Reynaud, Max and Emil Skladanowsky, William Kennedy Dickson (Edison is spared because all he ever did was market and claim credit for the ideas of more talented people), Wordsworth Donisthorpe, Louis Le Prince, William Friese-Greene, Auguste and Louis Lumičre, and ultimately everyone else involved in the invention of cinematography. It continues to jump through time and, each time someone comes close to inventing cinematography, it burns them to death with its flamethrower. Film and TV therefore never come into being.
This obviously has a huge impact on human history, such that you are never born, and are therefore never able to tell your robot to tone it down, man. But hey, the Little Shop of Horrors franchise never exists extends past a second film (or exists)!
I wish the book I just finished had a slightly more satisfying ending, without any reduction to the series' otherwise outstanding quality.