The Reactor is a boss in the Kirby series. The Reactor's only weaknesses are lasers and mach tornado.
Kirby Super Star
Reactor is a boss in The Arena and Revenge of Meta Knight only.
Kirby Super Star Ultra
Reactor is a boss in now Meta Knightmare Ultra. Reactor can easily be defeated by Mach Tornado.
Kirby's Epic Yarn
Reactor appears as a mini boss in the final level, Battle Ship Halberd and Moon Base. Unlike the other games, the Reactor shoots fire witch makes Kirby lose beads, and there's no laser.
- Reactor is the only boss that has 2 weaknesses in the whole Kirby series.