The Bears were the minor antagonists in Alpha and Omega.
The bears were first introduced when Humphrey accidentally made a bear cub cry. The first bear was the mother of the cub. She thought Humphrey was trying to hurt her cub on purpose and started chasing Humphrey all the way to Kate. Kate thought she and Humphrey can take the mom bear down, but then two male bears appeared alongside with the mother.
Humphrey tried to make the bears stop thinking about killing them by telling them a joke, which didn't work and he got a paw in his face. Kate tried to confuse the bears by showing her talent of being an Alpha, but that didn't work either. The bears cornered them on a fallen tree trunk stuck on a cliff. A blue colored bear tried to go on the tree trunk but he heard a snapping noise. Realizing the tree was about to fall, the blue bear stepped back and started shaking the tree trunk. He shook it so much that he fell as well. He slid and tried to kill the wolves. Kate and Humphrey gained an advantage by using a bark sled.
The bear eventually caught up to them. They looked at him then the bear started to looked worried. Humphrey asked him why was he looking like that. The bear pointed at a train that was moving. Kate and Humphrey made it in the train, but the bear went flying to the other side of the train track. Kate and Humphrey managed to escape from the bears and safely got in a train that is heading for Jasper National Park.