From English Wikipedia:
Odin Computer Graphics were a Liverpool-based computer games developer who came to prominence in the mid-1980s with a variety of titles for the ZX Spectrum, Commodore 64 and Amstrad CPC home computers
Prior to the release of their debut title, Nodes of Yesod, in 1985, Odin had previously released a number of games under the name Thor. Although they developed a couple of in-house titles as Thor, they mainly acquired the publishing rights to homegrown titles from anonymous bedroom programmers. These early titles were mostly regarded as critical disappointments but not commercial failures. When Thor decided to switch to in-house development, Paul McKenna (Managing Director & Owner) thought it appropriate to form a new joint company, hence Odin Computer Graphics was born.
Odin made a very deliberate attempt to ensure they were mistaken for Ultimate Play The Game, one of the most critically acclaimed game developers of the 1980s. As well as establishing a very similar name (Odin Computer Graphics vs. Ashby Computer Graphics), many of their games were heavily inspired by Ultimate's output (Odin's Nodes of Yesod certainly owes a considerable debt to Ultimate's Underwurlde). The advertisements for Odin's games, which won many acclaimed awards, also bore an uncanny resemblance to the highly stylised, airbrushed artwork that graced the adverts for Ultimate's games.
In 1987, Odin finally closed their doors, mainly due to an inability to expand the size of their teams while maintaining the quality that had put the company on the map in the first place.
In 2005, Paul McKenna reformed Odin Computer Graphics Ltd, to develop and produce new titles and convert Nodes of Yesod, Arc of Yesod, Heartland and Robin of the Wood on the Mobile Phone formats.