The Underground Ernie Magazine was a magazine series released every four weeks starting from April 4th 2007. It was priced at £1.75 per issue and was discontinued after the show went off air. The tagline for the magazine was "Big fun for tiny travellers"
Each issue featured a range of puzzles and colouring pages, as well as stories and guides for things to make and do.
- A sample issue of the magazine was included with copies of Summer Breeze ordered from the online Underground Ernie shop.