Mighty Jack is not a person but an organisation formed to combat a mysterious criminal organisation called Q. Atari is abducted by Q, Mighty Jack set off in their advanced submarine to rescue him before he will reveal the location of Mighty Jack's HQ under torture (and they succeed). Instead, Q launch an attack on Earth using hot ice which can't melt and to steal the Mighty Jack submarine...
Or something like that. At times it wasn't that clear what exactly was going on. The film is reasonable enough fun with plenty of Japanese model weapon action and furious running between perils though ultimately is a little dull overall. Hot ice must also be the worst super villain weapon ever.
