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Remarkable, a duplicating alien.

Phil Billings.[1]

Slapback is the Omnitrix's DNA sample of an Ekoplektoid from the planet Ekoplekton.


Slapback takes the appearance of a green metallic humanoid tortoise with grey eyebrows and green eyes. He wears a blue, black, and white jumpsuit covering all except for his arms and feet, as well as a grey and black mask.

Slapback wears the Omnitrix symbol on his back.

Powers and Abilities

Slapback is capable of duplicating himself to an unknown degree when his back is struck. This can also be accomplished whenever Slapback applies sufficient pressure on his own back by pressing the Omnitrix symbol.

The clones are not linked in any way and can act independently from one another.

Each time he duplicates, the resulting Slapback clones become smaller and stronger by a proportionate amount.[1]

Slapback's clones get more durable the more they multiply, with Slapback quarters being durable enough to harm Bashmouth, thanks to the metal that makes up their bodies, as it is quite tougher than crystal.[2]

Slapback's clones also become denser as they multiply, being able to withstand powerful winds.[2] It is possible for Slapback to duplicate enough to become as dense as a black hole.[DR 1]

Slapback is heat resistant and immune to lava. His clones are able to float on lava.[3]

Slapback is quite agile even while split into clones, as shown when his halves dodged Tetrax's crystal shard projectiles while riding some hijacked drones.[4]

The Slapback clones can fuse back together into the original Slapback form.[1]


Slapback seems unable to control his duplicating powers, as each strike on his back forces him to duplicate unwillingly.[1]

There is a clear limit to Slapback's flexibility, as he cannot reach his back if his arms are in a certain gesture.[5] Therefore, he is required to seek help from others when trying to activate either his duplication powers[6] or his Omni-Kix form.[7][8]

The combined weight and mass of each set of Slapback clones may cause issues to his surroundings.[9][10] This is due to his metal body being highly denser, which limits how many he can reasonably make but at the same time reducing the risk of copies being harmed.

Since each of the clones have their own sense of individuality, Slapback can end up fighting himself if incensed.[1]

If Slapback times out, the Slapback clones are automatically fused back to the original Slapback.[6]

Slapback's duplicating powers can be exploited, resulting in the clones being too small to take on others bigger than him.[11]

Slapback's clones can be fused back together with enough force.[12]

Slapback in his base form has a limited amount of strength that prohibits how much he can lift without splitting into clones, though even then certain opponents, such as a Tetramand or Arburian Pelarota, are resistant to the strongest state his clones can reach.


Ben 10


Ben 10

Season 3

Season 4

Season 5

Video Games

Cartoon Network Arcade

Xingo Mayhem

Slapback is a playable character, which is unlocked by default.

Naming and Translations

Language Name Origin
French Frappadouble From frappe, punch and double, double
German Doppelschlag From doppelt, double and schlag, punch
Italian Sdoppione From sdoppione, splitter
Polish Pacak
Portuguese (Br) Tapinha From tapinha, pat
Romanian Dublură From dublură, Copy
Russian Шлепок
From шлепок, slap
From the original English name
Spanish (HA) Slapback From the original English name
Turkish Böl-Geç From the original English name


Slapback's name is a combination of the words "slap" and "back"; this is a reference as to how his duplication powers work: by slapping his back.

A "slapback" is also a kind of doubling echo with relatively long delay between repetitions of the sound, so that the individual echoes can be perceived.


  • Slapback's name was coined by Gwen and approved by Max, Phil, and a Slapback quarter when his quarters held a vote on the name.[1]
    • Ben's proposed names for the alien were "Big Boy" and "Brawno."[1]
  • Slapback replaces Grey Matter in the active playlist. [13]
  • Slapback's voice becomes higher-pitched the more he duplicates.
  • It has never been established whether or not Slapback has a limit on his duplication.
  • Despite being introduced in the Reboot Continuity, Slapback also exists in the Classic Continuity.[DR 2]
  • Slapback's powers are similar to Echo Echo's, though the clones having individual personalities make him more in line with Ditto.
    • Their nature and execution of Slapback's powers (i.e. being able to create duplicates by applying kinetic energy anywhere on the body) are very similar to Multiple Man from Marvel Comics though while Multiple Man can use any part of his body, Slapback can only use his back.
    • Unlike either Ditto or Echo Echo, whose clones are able to affect the Omnitrix's time-out function, Slapback's clones disappear whenever he times out; Echo Echo only times out once reduced to a single body (either by fusing his clones or having all but one clone destroyed), whereas Ditto can only time out once his clones are in a close enough proximity to each other.


Duncan Rouleau

Introduced in Season 1 CannonboltDiamondheadFour ArmsGaxGrey MatterHeatblastOverflowStinkflyUpgradeWildvineXLR8
Introduced in Season 2 RathShock Rock
Introduced in Season 3 HumungousaurSlapback
Introduced in Season 4 GoopJetrayWay Big
Introduced in Season 5 Alien XBig ChillBloxxBuzzshockChromastoneRipjawsSpidermonkeySurge
Omni-Enhanced Aliens CannonboltDiamondheadFour ArmsGrey MatterHeatblastOverflowStinkflyWildvineXLR8
Omni-Kix Aliens CannonboltDiamondheadFour ArmsHeatblastHumungousaurJetrayRathShock RockSlapbackXLR8
Omni-Naut Aliens HeatblastJetrayHumungousaurShock Rock
Fusion Aliens Amalgam AlienAmalgam BenGrey ArmsXLRArmBlastDiamondHeat
Non-Canon Aliens Banana AlienBlack Hat AlienHotdawgMole-StacheScooter Alien
Non-Canon Fusion Aliens Omnitrix Glitch FusionDiamondhead-Humungousaur FusionRath ArmsShock Blast