Contra Wiki
Contra Wiki

Horrible Heartbeat (戦慄の鼓動 Senritsu no Kodō?), also known as Shivery Beat or Pulse of the Terror, is a music theme originally composed for Contra. It is the background theme for the last stage of the game, Alien's Lair. Since then it has become a widely popular theme and diverse arrangements have appeared throughout the series, as well as in promotional media.


Title Game Stage Audio Usage
Horrible Heartbeat Contra (arcade) Alien's Lair BGM
Shivery Beat Contra (NES) Alien's Lair BGM
Contra: Operation Galuga (Retro Mix) Alien Hive
Shivery Beat Contra (MSX2) Alien's Zone
Vicious Space
Fighting Jungle 2 Wai Wai World 2: SOS!! Parsley Castle World 4 Alien King boss fight
Alien Lair Operation C Area 5 Hayanos 614 and Black Viper boss fights
Heart Battle Contra 4 Alien Hive Gomeramos King boss fight
Contra: Operation Galuga (WayForward Mix) Ruins Beowulf miniboss fight
Horrible Heartbeat Contra ReBirth Red Falcon Megalith BGM
Shivery Beat Contra: Evolution Alien's Lair BGM
Contra Returns Stages 2-6, 5-3, 5-4, 12-5, 13-1, 13-4, 13-6, 15-3, 15-4 BGM
What they were Growing in the Lab Contra: Operation Galuga Escape Ship (inside Java section) BGM
Alien Slayer Contra: Operation Galuga (Retro Remix) Alien Hive BGM