Dragon Knight: Alien Invaders

is a series by Sierra.

Overview
''After Kamen Rider Dragon Knight, some alien invaders destroy Ventara. So Adam, Hunt, Chance, and Price flee to Earth. But Kit is nowhere to be found. They look around but are captured by the enemy. Len and Kit are hiding from the rest of the world, training. However, the invaders of Ventara have come to Earth. And when Len and Kit realize this, their vents and decks accidentally break. So they create new devices: Anti-Invader Force Morphers, or simply AIF tools. They try to get the other Dragon Knight Riders, but most have been captured. Kase meets up with Len and Kit. The invaders destroy Earth, making the remaining humans their slaves. So Kit, Kase, and Len race through space while fighting the invaders. But there are things they haven't learned about the AIF tools....