Krull for the Atari 2600 is based on the movie of the same name. It was released late in 1983 and video game sales were plummeting at this time so Krull probably didn't sell as well as it could have. For

Source: Krull is a 1983 arcade game based on a film of the same name. The home release was originally planned for the Atari 5200 but poor sales of that machine led to it being released on the Atari 2600