Amazon’s upcoming superhero show may be a cartoon, but that doesn’t mean it’s family-friendly. Instead of PG-rated Spider-Man style antics, you should brace yourself for some “savage brutality”. Talking at the Invincible panel as part of IGN Fan Fest, Robert Kirkman - writer of the Invincible comics and executive producer of the show - told us: “It's a very mature show, very much like the comics.