Bubbler (バブラー) was set to appear in Chemical Plant Zone in the game Sonic the Hedgehog 2; however, it was scrapped like its "parent."
It is dropped onto the ground by Bubbler's Mother and would then proceed to bubble up before exploding.
- While it did not return as a normal enemy in the Christian Whitehead-produced 2013 mobile re-release of Sonic the Hedgehog 2, it does appear as a new Chemical Plant object in Debug Mode.
- Its eyes were edited into the sprite of Knuckles the Echidna glaring from the bushes in the extended good ending of the 2013 re-release.
|| Sonic | Tails | Knuckles | Super Sonic | Super Tails** | Super Knuckles | Dr. Robotnik | Mecha Sonic | Becky | Flicky | Pocky | Pecky | Cucky | Ricky | Picky | Rocky | Locky | Wocky | Rat | Tocky | Tux | Chirps
|| Alligator* | Aquis | Asteron | Balkiry | Banper* | BBat** | BFish* | Bubbler* | Bubbler's Mother* | Buzzer | Cactus* | Chop Chop | Clucker | Coconuts | Crawl | Crawlton | Flasher | Frog* | Gohla | Grabber | Grounder | Jellies** | Lobster* | Masher | Nebula | Octus | Rexon | Shellcracker | Slicer | Snail* | Spiker | Spiny | Stegway** | Turtloids | Redz** | Whisp
|| Emerald Hill Zone | Chemical Plant Zone | Aquatic Ruin Zone | Casino Night Zone | Hill Top Zone | Mystic Cave Zone | Oil Ocean Zone | Metropolis Zone | Sky Chase Zone | Wing Fortress Zone | Death Egg Zone | Hidden Palace Zone** | Genocide City Zone* | Dust Hill Zone* | Rock Zone* | Winter Zone* | Egg Gauntlet Zone** | Boss Attack Zone** | Proto Palace Zone** | Special Stage
|| Drill Eggman | Water Eggman | Tonkachi Eggman | Catcher Eggman | Submarine Eggman | Drill Eggman II | Brass Eggman** | Submarine Eggman II | Flying Eggman | Barrier Eggman | Mecha Sonic | Death Egg Robot
|| Climb | Glide | Spin Jump | Super Dash Attack | Super Spin Attack | Insta-Shield**
|| Ring | Monitor (Super Ring, Shield, Power Sneakers, Invincibility, Extra Life, Teleporter, Eggman, Lightning Shield**, Flame Shield**, Water Shield**, S** | Continue | Spring | Star Post | Bumper | Switch | Air Bubbles | Signpost | Capsule
|| Original Soundtrack | West Side Island | Chaos Emerald | Debug Mode | Spikes | Gondola | Corkscrew Loop | Totem Pole | Shuttle Loop | Booster | Winding Tunnel | Crusher | Seesaw | Bomb | Cannon | High-Speed Elevator | Conveyor Belt | Tornado | Dr. Eggman's Rocket Ship | Mega Mack | Pinball Shooter | Slot machine | Spear | Spiked Ball | Stone Pillar | Flipper | Gallery
*Exclusive to the Prototype/beta version of Sonic the Hedgehog 2.
** Exclusive to 2013 re-release version.