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“Why he was, in a way. He could make an entire building disappear in just a matter of seconds! He was the kingdom's greatest demolitions expert. And then one day, he just quit. No one knows why! He might be just the man to help us out!”
Merlok 2.0 in "The Stranger in the Halps"

The Great Slab Rockowski is a demolitions expert and a former cohort of Merlok 2.0. He lives in a now-destroyed house in the Halps and has a rabbit named Bunny.


Prior to the series

Slab was once a great demolitions expert known as the Great Rockowski. Merlok was one of his close allies and they fought together on many occasions. At some point, he stopped destroying, got a house in the Halps, a rabbit, a rock named Donny that he chose to "befriend," and became sort of a "hippie" type. He also began to make "tree art."

The Stranger in the Halps

While trapped in the Halps, the Nexo Knights did not know what to do, but Merlok 2.0 told them to keep driving in order to find a house belonging to Slab Rockowski. However, they were surprised to find that he had become lazy. Merlok tried to convince him to destroy the Stone Monsters, but Slab refused, stating that he stopped destroying many years ago.

When Jestro, Monstrox and the Stone Monsters (as well as the new Rubblers) attacked the house, they began to destroy the tree art, making Slab angry. Slab surprisingly grabbed two rocks and began to destroy all of the Stone Monsters quickly. When they couldn't be destroyed fast enough, he rolled Donny across the mountain, destroying more Rubblers.

After Monstrox's defeat, Slab stayed at his house with Bunny.


Nexo Knights

Season 4: The End


  • His name is a play on the words "slab" (a type of stone) and "rock," as he uses rocks to demolish opponents.
  • He is portrayed by the late Kirby Morrow, who portrayed a character associated with rocks, Cole, in another LEGO theme, Ninjago.


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Nexo Knights: Merlok 2.0 · Clay Moorington · Lance Richmond · Aaron Fox · Macy Halbert · Axl · Robin Underwood
Allies: Ava Prentis · Jestro · King Halbert · Queen Halbert · Herb Herbertson · Alice Squires
Squirebots: Aaronbot · Axlbots · Chili Vanilla · Claybots · Cowbots · Éclair · Haute FancyPants · Kingbot · Lotta Fun · Lotta Budget · Macybot · Manuel · Persnickety Marge · Riccardo
Merry Mechs: Robot Hoodlum · Dennis · JohnBot
Knights' Academy: Beak · Brutzle · Captain Clash · Chef Munch · Ethan Zilgo · Fletcher Bowman · Griffiths · Izzy Richmond · Knightmares · Ottofae · Relik · Scapeland · Swordmore Brickland
Tighty Knighties: Jorah Tightwad · Shia LaBlade · Jousting Bieber · Brickney Spears · The Blok
Lava Monsters: Mayor Magmar · Beast Master · Lavaria · Whiparella · Moltor · Flama · Burnzie · Sparkks · Bookkeeper · Infernox · Ash Attackers · Crust Smashers · Flame Throwers
Stone Monsters: Monstrox · Stone Colossus · Ruina Stoneheart · Krakenskull · Garg · Roberto Arnoldi · Three Brothers (Roog · Reex · Rumble) · Harpies (Hilda · Ingrid · Ulrika) · Roguls · Gargoyles · Grimrocs · Stone Stompers · Stone Monster · White stone statue · Bedrock Monster
CyberBiters: Monstrox · Dragov · Ruina Stoneheart · Fred · Pola · Cezar · Berserker · MechaByter · MegaByter · VanByter No. 307 · VanByter No. 407 · CyberByters · InfectoByters
Forest Monsters: Mushlord · Baron Badwood · Dame Flora · Bramblina · Loggerhead · Deadwood & Knot · Elm of the Dark Realm
Sea Monsters: Behemoth of Brine · Marquis de Seaweed · Siren · Sharkerado · Mate Squiddybeard · Savage · Poop · Deck
Order of the Eight: Augustin Halbert · Reginald Brickland · Therence Richmond
Other: Aaron's father · Aaron's mother · Arthur Eaglewing · Axlina · Baron von Bludgeoneous · Cheddarton · Chopper · Coughmeyer · Cuthbert Richmond · Dustin Hoffmeier · Edvard Evanson · Gobbleton Rambley · Goldie Richmond · Hadda Hammerin · Jack Shields · Jebediah Hazard · Jestro cosplayer · Jestro cosplayer's grandmother · Jokes Knightly · Jurgen von Stroheim · Lance cosplayer · Mama Axl · Maynard · Mooper · Morty · Ned Knightly · Papa Axl · Princess · Ramsey · Robin's father · Roger the Scrubber · Roger van Nelsing · Royal Soldiers · Slab Rockowski · Trix Taylor · Woody Carverer