Thunderstone.

Thunderstone is an Australian science fiction children's series broadcast on Network Ten from 12 February 1999 to 8 September 2000. Created by Jonathan M. Shiff, the show is set in a post-apocalyptic future where a comet has destroyed most life on Earth. The year is 2020. 15-year-old Noah Daniels lives with his family in the futuristic underground community of North Col. The world above is a frozen wasteland after the comet destroyed all other life including the animals. One night, Noah accidentally time travels to the future and finds himself trapped in 2085 in a desolate desert called Haven with a group of children, the Nomads, led by Arushka.