In 1952 Dodd's family moved from Ireland to Port Dover, Ontario in 1952. His mother was a music teacher at Port Dover Public School. On November 23, 1956 Cathal was born in Manitoba, Canada.
In the 1970's as a teenager Dodd performed in a band called Deja Vu.
He co-hosted the Canadian TV series Circus on CTV with Sherisse Laurence from 1978 to 1983.
Cathal J. Dodd is best known for his portrayal of the Marvel Comics character Wolverine in X-Men: The Animated Series and the Marvel vs. Capcom series of video games. Cathal also provided the voice of the hero/villain Random Virus in the BBC series Ace Lightning.
Dodd recorded with producer Bob Hahn in Canada, which consisted of demos and material to be submitted to major labels. His recordings ended up on the RCA label, with a full length album release "New Horizons" on Hahn's own "Rising Records" label in 1975.
- While casting Wolverine in X-Men: The Animated Series the creators of the series had in mind a voice that sounded like Clint Eastwood (but deeper, lower register) and Robert Mitchum.
- Cathal J. Dodd was credited as Cal Dodd in Spider-Man: The Animated Series and X-Men: The Animated Series.