Foss (フォス Fosu) is an enemy in the Gradius series.
Foss was introduced in Gradius, particularly in Stage 3, Moai. An upgraded version called Foss Mk II was introduced in Salamander.
Another formation enemy; Fosses move in snake-like waves, homing right into the Vic Viper, somewhat like Rugals. Destroying the entire formation will cause a capsule to drop from the last one.
- The variation of this enemy called "Winger" is probably a reference to the rock band of the same name, which was most prominent during the '80s and early '90s.