The Troublemakers are the main antagonists of Team Umizoomi.
Little Trouble is short, thick, has an orange Mohawk, and wears round, blue glasses. He also wears yellow shirt with purple stripes, along with a purple belt with yellow stripes. Big Trouble is tall, thin, has blue spikey hair, and wears goggles. He also wears a purple shirt with yellow stripes, along with a yellow belt with a purple stripes.
Both brothers are mischievous, who both like to cause trouble. They sometimes break into fights when they don't agree with each other or when their plan fails. Little Trouble acts smarter than his brother, Big Trouble, who acts dimwitted, making him bully Little Trouble.