In the beginning of the 1st episode of Hundred, Yamigedo is eating a planet after it was destroyed by the Hundred Demons
Ikazuchi was tricked by First Knight of the Apocalypse, Gratos into releasing Yamigedo's seal. Then, the Fuchigami Clan was turned to stone and Ikazuchi had his memories altered by Gratos to believe he was abused by his clan and that he knowingly unsealed Yamigedo to get revenge on them.
In 37th Episode of Hundred, Gratos assembled the Inverse Fiends to do the Yamigedo Seal Prevention Formation to thwart the Omni Lord's Sealing Ritual. With that, Yamigedo was able to successfully metemorphise into O-Yamigedo.
In the 38th episode of Hundred, Yamigedo awakens on the moon evolved into Specter of Darkness Wasteland, O-Yamigedo and devours the Eight Omni Lords, and their allies and proceeds to head to Earth from the Moon. Also, The Inverse Fiends have their Inverse Omni Lords.
DDD:
The whole 10th episode of DDD has Gao turning into a fish.
One of the scenes of the 11th episode of DDD has Gao still as a fish.
During Gaito's flashback about his pet Sparrow, a cat appears, and kills the sparrow onscreen, traumatising the poor kid.
Ace:
In the 11th Episode of Ace, Ranma falls off the cliff.
In the 13th Episode, 19th Episode and 23rd Episode of Ace, When Vile Ranma covers the flag to Lost World, Vanity Husk Destroyer appears in his large form with a roar.
In the 29th Episode of Ace, When Haru tells his brother that he's now an ally of Lost World. Both the background and the music is dark and scary.
