Hachihyaku is an antagonist of the Dragonball Z OVA "The Plan to Eradicate the Saiyans". It first appears as Dr. Raiichi's supercomputer, but later materializes into a powerful fighter after absorbing the pure hatred of Dr. Raiichi. Afterward, the supercomputer appeared to be too powerful for the Z Fighters to handle. Luckily, after about 15 minutes of a rather one-sided fight, Goku learns of Hachihyaku's weakness; Hatchihyaku only fires his energy blast after 15 seconds. Knowing this, Goku and the others begin powering up their strongest blasts, and fire at the count of 15. This proves to be more than enough to destroy Hachihyaku.
Hachihyaku is said by Goku to be stronger than Broly.
but it should be noted goku said this before the second figth with broly in the second coming broly would be much stronger due to his saiyan harritage