15 Transforming Bosses That Made Life Hell

Sigma – Megaman X4

Sigma just never learns but his over-the-top final boss shenanigans are craziest in Megaman X4. First you start by fighting a Grim Reaper-esque floating version. He eventually casts away the cloak for lasers and a boomerang staff. The next phase is…interesting as Sigma dons a different body and manifests several large robot heads to trap and ensnare you. Once that’s done, you fight his large head stuck to the floor, avoiding projectiles and spikes along with the giant robot heads.