From Zzap 64, Issue 35:
An evil robot calling itself Nektron has enslaved three peaceful planets and forced their inhabitants into subservience. As a member of the Manoeuvrable Armed Computer Humans - or MACH team - the player is sent to destroy the tyrant.
From the game's advert:
Enter the exciting world of M.A.C.H. and get real arcade action!
Giant Playfields: 3x25 action screens
Multidirectional smooth scroll
Over 200 animated sprites
Special 2 Player team mode
Are you ready to challenge the robots?
Planet 1: Here you must destroy the robots warning-system, the slave-leaders and this dreadfull [sic] robot.
Planet 2: With both Mega-Blaster and repeat-fire active, you can blast your way through to planet 3.
Planet 3: The final planet is full of mysterious robots, and a giant army of special space force troopers. Beat the final robot and win!