The Eye That Shines in the Darkness (E16)

Cherry Blossom 9 has returned to Earth after disappearing for 3 months. Elsewhere, a boy named Hiroshi returns to a Mt. Hades playground, where he finds a strange stone. Bullies try to steal it, only to double over in pain, though Hiroshi is unaffected. Later, the boy drops the stone into boiling sulfur. It transforms into the saurian Annon, causing a landslide that knocks Dan and Hiroshi out. (Prime Video)