Spectre (Specter in some localizations) is the Grand Canyon boss from Strikers 1945 III.
In Battle Edit
Spectre appears as a helicopter form with two sets propellers. He can fly around to battle the player. When you defeat this form, he will transform into a stag beetle. Watch out for the bullets and then he reveals the blue orb. When the blue orb disappears, he continues to battle with the player. Then fires bullets from the his predecessor and then more bullets will appear. First, you will try to avoid the bullets when damaging the Spectre. When you defeated Spectre, he explodes and you earn money.