Reactor

Reactor is a boss in the kirby series.Reactors 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 easly be defeated by mach tornado

Kirbys Epic Yarn
Reactor Appears as a mini boss in the final level,battle ship halberd and moon base.unlike the other games,reactor shoots fire witch makes kirby lose beads,and theres no laser

Trivia

 * Reactor is the only boss that has 2 weaknesses in the hole kirby series.