Instructions
Enter the ninth level, where Jimmy Neutron starts out in a public park. Look for Carl and approach his character in the game. Carl is where the llamas are, so if you can locate Carl, you will see the llamas next to him.
Capture the Twonkies, who have let the llamas out of their corral. You have to attack the Twonkies first, before attempting to herd the llamas, otherwise the Twonkies can damage your character and others in the game.
Walk Jimmy up to the llamas. As you approach the llamas they will begin moving in the opposite direction. So if you come up to them from behind they will start to move forward.
Continue walking behind the llamas toward the pen. Some of the llamas will go in, but others will shift directions. If the llamas shift directions, such as turning to the left or the right of where the pen is, move Jimmy so that he follows behind them and redirects them back to the pen. Remember that the llamas walk in the opposite direction of Jimmy Neutron. So, if the llama turns left and you want it to go right, you will have to get Jimmy on the left side of the llama so it turns in the right direction.