What do you get when Sonic, or someone who is clearly supposed to be a representation of him appears in something that's NOT a Sonic show or game? You get a 'Sonic Cameo'! These aren't items, they're representations of Sonic or Sonic characters appearing outside of anything where you'd expect to find him. Since Sonic is so popular it's no wonder that a variety of different media reference him. By looking at these photos, screen shots, videos and more, you can track down the original things and watch them/see them for yourself.
This is a promo video for the game Mod Nation Racers. The game is a cart racer, but it has a cool gimmick of LOTS of customize-able parts. Not only can you customize the cars, but you can customize the drivers too. And it goes steps beyond usual customs, which let you re-color items only--by this time letting you tack 3D things on which you make. It also appears to start you off with pre-made customs of famous characters, approved by their owners (which, as it seems here, includes Sonic) The whole thing seems to be a great idea because really, you know Sonic & crew, plus super heroes & etc would be some of the first things that fans made with the game anyway. Discovered by Glaysson
This is a compilation of most of the scenes in which Sonic cameos in the game SegaGaga for the Dreamcast. SegaGaga was a Japan only release, and it was an RPG. However, it wasn't very popular, so it remained obscure, despite all the cameos & anime style
opening. The plot is roughly that Sega has lost most of its market-share in 2025, to DOGMA, a possibly sony-representing rival company. An executive (seen in the intro) somehow causes Project SegaGaga, and the game, hopefully, to restore Sega to number 1. The entire intro looks like an anime, and so do the cut-scenes. Other famous Sega characters are sure to appear if you play it. (Alex Kidd, etc) NONE of it is translated, so you can't really tell what's going on. The video DOES have Sonic's cameos, including one where he's a SA1 cardboard cut-out graphic that gets missiles shot at it for some reason. You can see the
Full SegaGaga Intro and also the full
Sonic+Tails meet the protagonist part. Discovered by AutobotWheelie

You can spot the Sonic cameo if you look carefully at this TV Show screen shot. This shot was taken in Bernard's Watch, which is a children's show on British tv. If you look carefully behind the old guy's cap, you'll see classic style Sonic in a ship window, or possibly on a wall. It looks like it's an un-official art piece or some kind of decoration. Still, it's quite interesting to spot. Screen cap provided by NazoTheDragon
This is a screen from the show "Tosh.0" . This show appears on Comedy Central in 2010, and mostly makes fun of the internet in general, and will run web videos, monologues and skits. For a particular skit, he attempts to do a speed run to get onto his stage (which is entirely greenscreen/virtual anyway) and the virtual screen shows Sonic on a speed run in Emerald Hill as seen here. When whoever was playing it for the video misses a ring, he calls them out on it too. It's interesting to see incorporated into a skit! Screen cap by Berzerker
Red Herring Cameo!
In Toy Story where Buzz Lightyear is shown pushing a tool box, you can see a moving van outside. On the side of the van is written E.G.G.M.A.N. Info by Shade1602
However, it actually has nothing to do with Eggman/Robotnick. The reference is for their art director Ralph Eggleston. Pixar is known to hide many interesting small clues or gimmicks among their movies, so this sort of thing is typical to them. you can read about it at http://pixar.wikia.com/Eggman_Movers Info by MB27
which is their own wiki to explain such gimmicks. (This red herring cameo is much like in the song "I am the Walrus" where it mentions "The Eggman". It was written so far ahead of Sonic, that it has nothing to do with anything.)