Grunt was a member of the Bull Clones.
Note: Due to most of the Bull Clones being identical in appearance, it is almost impossible to determine who is who in the television series. As such, any appearances of a Bull Clone will be cataloged here, regardless if they are in fact Grunt.
Grunt and the other Bull Clones wait for Princess Iron Fan and Red Son to free the Demon Bull King until they watch Bob attempting to pull the Golden Staff off the mountain but failed. After Red Son was able to pull the Golden Staff off, Grunt and the Bull Clones (sans General Ironclad and Bob) cheered. However, when MK inadvertently used the staff, Grunt and the other Bull Clones attempt to take it from him but were overwhelmed when he used the staff again.
At the Flaming Foundry, Grunt made more of the Bull Clones or talked to some of them.
Grunt and the other Bull Clones break into the Weather Station to help Red Son take control of the city's weather. When MK and his team attempt to stop Red Son, Grunt and the other Bull Clones captured them after MK accidentally injured Mei and Sandy, as he couldn't control his powers.
However, after the Monkey King limited MK's powers, Grunt and the other Bull Clones were defeated.
While Red Son was taking with Princess Iron Fan, Grunt and the other Bull Clones were digging up the tomb the Demon Bull King discovered.
Grunt and the other Bull Clones continued to dig up the energy source the Demon Bull King found until one of them was able to dig up the tomb. However, once the tomb was opened, the energy source took possession of the Demon Bull King as well as Grunt and the other Bull Clones.
During the Battle of the Flaming Foundry, Grunt and the other Bull Clones attack MK's team to prevent them from reaching the Demon Bull King.
After MK freed the Demon Bull King from the evil spirit's possession, Grunt and the other Bull Clones were freed from the possession as well, but were deactivated as a result.