To Mega Therion is the debut album by Swiss extreme metal band Celtic Frost, released on 27 October 1985 by Noise Records. The cover artwork is a painting by H. R. Giger entitled Satan I. The album was a major influence on the then-developing death metal and black metal genres.
Presented on 2 180g SILVER vinyl with bonus material, 32 page booklet and 2 posters.