You will Watch Fantastic Four: Worlds Greatest Heroes Episode 23 online for free episodes with HQ / high quality. Stream cartoons Fantastic Four: Worlds Greatest Heroes Episode 23 Johnny Storm and the Potion of Fire During a confrontation with Diablo, Johnny is accidentally exposed to one of Diablo’s potions he planned to use to gain control of all the elements. As the days go by Johnny seems to change. While small at first, Johnny starts to grow in power. After Johnny seriously starts to lose control, Ben, Reed, and Sue try to capture him to figure out what’s wrong. Sue almost succeeds, trapping him inside a force field where his fire will burn up all the air and knock him out.