At the beginning of the battle, Demos will first assemble itself by having its core come flying from the left side of the screen, destroying the player if they happen to be in its way; then it will properly commence its attack.
The laser turrets are indestructible and must be dodged. They will aim at the player, but only to a certain degree. Also, Demos will release Duckers from slots on its top and bottom, starting a standard tradition in the series.
In the arcade version of Gradius II, Demos has eight lasers and two Ducker slots; whereas in the Famicom version, it became much weaker, with less health overall and only four laser turrets.
- Demos' name comes from Deimos (Δεῖμος – "dread"), the Greek personification of dread.
- Demos has several safe spots, some include directly in front of it, on the ground to the right, or inside it. All of those were actually left intentionally by the game's designers.
|Gradius II: GOFER no Yabō|
|Stages (arcade)||Artificial Sun • Alien • Crystal • Volcano • Revenge of Moai • High Speed Maze • Boss Rush • Gofer Ship Interior|
|Port-exclusive stages||Volcano - Crystal (NES) • Enemy Base (NES) • Gofer's Lair (NES) • Temple (PC-E)|
|Bosses||Phoenix • Big Eye • Giga (NES) • Crystal Core • Death MK II • Jumping Moai • Big Moai • Desert Core (PC Engine) • Big Core MK II • Zub Rush • Big Core • Golem • Tetran • Gaw • Intruder • Zelos Force (NES) • Covered Core • Demos • Crab • Gofer|
|Other||Reckless • Striker • Heavy Ducker • Hydra • Ground Spider • Cerberus|