Template:Species-infobox Shellcreepers are green-shelled turtles that first appeared in the Mario Bros. arcade game. They are the first turtle enemies to appear in a Mario game, making them the conceptual ancestors of the Koopa Troopas, which appeared two years later in Super Mario Bros.. It is also shown that Shellcreepers wear undershirts and shorts when outside of their shells; Koopa Troopas first appeared out of their shells in Super Mario World wearing a shirt, and in Super Mario World 2: Yoshi's Island wearing shorts.
History
Mario Bros.
The Shellcreeper is the first enemy to appear in Mario Bros.. They walk out of the Warp Pipes at the top of the screen and walk towards the pipes at the bottom of the screen. The player must hit it from below to flip it over and run into it to defeat it. If the player does not run into it, the Shellcreeper jumps out of its shell (revealing that it wears a white shirt and shorts), flips its shell over, changes color from green to purple and continues moving faster than before. If it flips its shell again, it will turn red, its fastest state. If a Shellcreeper is the last target for the phase, it will automatically turn red. Unlike the similar Koopa Troopa, jumping on Shellcreeper will cause Mario or Luigi to lose a life.
Following the Mario Bros.-style minigame in Super Mario Bros. 3, Shellcreeper has been replaced by Spiny in all subsequent versions, so they would not be mistaken for a Koopa Troopa, which is safe to jump on. Despite this, a lone Shellcreeper still makes a cameo alongside a Sidestepper and Fighter Fly on the Game Boy Advance Mario Bros. title screen.
Mario Bros. Special
In Hudson Soft's 1984 sequel of sorts to Mario Bros., Mario Bros. Special, Shellcreepers make a return appearance as enemies, though this time they can't be stunned by hitting them from below; instead, they can be stunned by jumping on a trampoline that they're on (second stage), jumping on a conveyor belt that they're on (third stage), or killed instantly by jumping over or next to them and hitting a platform, though they will often respawn if killed this way.
Punch Ball Mario Bros.
Shellcreepers appear as an enemy yet again in Hudson Soft's semi sequel to Mario Bros., Punch Ball Mario Bros.. The game is much closer to the Mario Bros., and thus Shellcreepers play a much more similar role as they did in that game. The only differences are that they can't be stunned from below and are instead stunned by Punch Balls, and that they do not change color if they get back up after being stunned.
Mario Power Tennis
Shellcreepers, along with the other Mario Bros. enemies, appear in the background of the Mario Classic Court in Mario Power Tennis.
Super Smash Bros. Brawl
In Super Smash Bros. Brawl, Shellcreepers appear on the Mario Bros. stage. They walk out from the pipes at the top of the stage. If knocked over by hitting them from below or from an attack, they can be picked up and thrown at opponents, making them fly sideways off the screen. The Shellcreepers also have their own trophy.
Super Mario 3D World
Shellcreepers appear in Luigi Bros., an additional game featured in Super Mario 3D World. Like the other enemies in Luigi Bros., Shellcreepers behave in the same way as Mario Bros., which this game is based on.
NES Remix
Shellcreepers appear in NES Remix in the challenges and remixes based on Mario Bros.
Super Mario Maker
In Super Mario Maker, a green-colored Shellcreeper is present as an unlockable playable costume. Its look is based on that from Mario Bros., and its movements as well. Whilst the player presses 
on the GamePad, the Shellcreeper shows off his teeth in a menacing yet comical way; likewise, if the player dashes with the character, its shell will turn red.
Game appearances
| Title | Description | Release date | System/format |
|---|---|---|---|
| Mario Bros. | Enemy | 1983 | Arcade |
| Mario Bros. Special | Enemy | 1984 | PC-8801, PC-6001mkII/PC-6601, PC-9801, FM-7, Sharp X1, Sharp MZ-1500, Sharp MZ-2200, Hitachi S1 |
| Punch Ball Mario Bros. | Enemy | 1984 | PC-8801, PC-6001mkII/PC-6601, FM-7, Sharp X1, Sharp MZ-1500 |
| Kaettekita Mario Bros. | Enemy | 1988 | Family Computer Disk System |
| Mario & Luigi: Superstar Saga | Cameo on the Mario Bros. title screen. Also in the Super Mario Advance ports. | 2003 | Game Boy Advance |
| Mario Power Tennis | Cameo as enemy on Mario Classic Court | 2004 | Nintendo GameCube |
| Famicom Mini: Mario Bros. | Enemy | 2004 | Game Boy Advance |
| Super Smash Bros. Brawl | Cameo as enemy found on the Mario Bros. stage | 2008 | Wii |
| New Play Control! Mario Power Tennis | Cameo as enemy on Mario Classic Court | 2009 | Wii |
| Super Mario 3D World | Enemy in Luigi Bros. | 2013 | Wii U |
| NES Remix | Enemy/objective in Mario Bros. challenges and remixes. | 2013 | Wii U |
| Super Smash Bros. for Wii U | Cameo as a trophy. | 2014 | Wii U |
| Super Mario Maker | Unlockable playable character. | 2015 | Wii U |
Super Smash Bros. Brawl trophy
| Name | Image | Game | Description |
|---|---|---|---|
| Shellcreepers | 
|
NES Mario Bros. | Shelled enemies Mario and Luigi faced back when they were plumbers. They had to be bumped from below to flip them over and then kicked off the stage. The last one on a stage turned from green to red and raced really fast. If one got flipped but not sent off, it would eventually right itself and move at high speeds. They were simply called "turtles" in Japan. |
| GBA Super Mario Advance |
Super Smash Bros. for Wii U trophy
| Name | Image | Appears In | NTSC-U Description | PAL Description |
|---|---|---|---|---|
| Shellcreepers | 
|
ARCADE Mario Bros. GBA Super Mario Advance |
With a name that implies silently sneaking up on its prey, the Shellcreeper might be considered cooler than your average turtle. The Koopa is apparently an evolved form of this veteran of Mario Bros. We'd recommend not jumping on this one like you would a Koopa, though... | With a name that implies silently sneaking up on its prey, the Shellcreeper might be considered cooler than your average turtle. A true veteran from way back in Mario Bros., this guy even predates Koopas, which apparently it evolved into. We wouldn't recommend jumping on this one like you'd jump on a Koopa, though... |
Names in other languages
| Language | Name | Meaning | Notes |
|---|---|---|---|
| Japanese | カメさん Kame-San シェルクリーパー Sherukurīpā[?] |
Mr. Turtle Shellcreeper |
|
| German | Schildkröte[?] | Turtle | |
| Italian | Tartaruga[?] | Turtle | |
| Korean | 거북님[?] Geobuk-Nim |
Translation of Japanese name | |
| Spanish | Tortuga[?] | Turtle |
| Mario Bros. | |
|---|---|
| Characters | Mario • Luigi |
| Items and objects | ? Blockb • ? Kinokoc • Cardb • Coin • Eggd • Fish Skeletond • Floor • Garbage cand • Heartd • Koopa Shelld • Ladderb • POW Block • Starmand • Super Mushroomc • Wafera |
| Enemies | Booc • Bowserd • Fighter Fly • Fireball • Icicle • Koopac • Shellcreeper • Sidestepper • Slipice • Spinybcd |
| Other | Gallery • Staff |