Boss Creature

"Boss Creature" is the only name for a bioform only known to exist in concept art from an employee of Next Level Games. The concept art found on this artist's profile also depicts another creature that is a "boss design for Metriod[sic]". It is possible that this artwork was created for a Metroid prototype that was shelved or canceled when Nintendo asked Next Level Games to make Luigi's Mansion: Dark Moon. An Iwata Asks feature concerning Dark Moon may confirm this theory:

Iwata: What was your impression at Next Level Games when you first heard about this project?

Bryce: At the time, we were actually involved with a completely different project for Nintendo, and one day we had a video conference about that.

Chad: We had made a prototype in preparation for that meeting.

Bryce: ''And Kensuke Tanabe-san suddenly started something like a drumroll and said, "You're gonna make Luigi's Mansion 2!" I was so surprised I could barely speak.''