Enemy Programs (敵性プログラム?), or Attack Programs (攻性プログラム?), are the hostile programs within the Moon Cell, attacking Masters and Servants in the Moon Holy Grail War.
Known Enemy Programs
Attack Program
The Attack Programs do not feature in Fate/Extra or Fate/Extra CCC, but instead make up the majority of the armies in Fate/Extella. They do not possess any particular allegience, with the same type of program being employed by every faction, their only difference being distinct colouration.
Cluster Horn
Crix
Enforcer
Fishbite
Insanity
Inspire
Klein
Pradox
Swindle
Viper
Watcher