[1] His most notable role was as Edward 'Ned' Malone in the TV series Sir Arthur Conan Doyle's The Lost World, which was shot in Australia, which he played from 1999 until 2002,[2] although his appearances in the final season were curtailed due to Australian tax laws.

[3] During the shooting of The Lost World, he purchased a home in Australia and met his wife there.

[citation needed] Orth voiced Blizzard in Iron Man: Armored Adventures.

He has also starred in Beyond Reality, The Ray Bradbury Theatre, the episode "Scarecrow" on the CW's horror/drama series Supernatural, and the two-part premiere of R. L. Stine's The Haunting Hour: The Series.

[4] He has also appeared on stage, including in Colin Thomas's Flesh and Blood in 1991.