Terra Obscura first appeared in Tom Strong #11 (January 2001). Terra Obscura is an alternate version of Tom Strong's Earth. On his visit to Terra Obscura, Tom meets his counterpart Tom "Doc" Strange, and the team of science-heroes known as the Society of Major American Science Heroes (SMASH). All the members of SMASH are based on superhero characters previously published by Nedor Comics in the 1940s.

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