Generation War
In October 2018, Eita announced that R.E.D would be joined by two new members, with their identity being kept in secret under the disguise of Dr. Muscle, known as the Green and Red Masked Demons, respectively. On December 15 at Final Gate, Hulk and YAMATO defeated Eita and Big R Shimizu to regain the Open The Twin Gate Championship. Three days later, Hulk turned on YAMATO to join R.E.D, revealing himself to be the Red Masked Demon. He would blame YAMATO for inviting KAI to the stable, while he was injured when KAI also had a neck injury. This led to Hulk stealing the Open The Twin Gate Championship belts. Afterwards, R.E.D began a "Generation War" against Dragon Gate and Toryumon. On December 22, YAMATO forfeited his half of the Open The Twin Gate Championship, leading to Hulk protest against the decision. Afterwards, General Manager Takayuki Yagi declared the titles vacated, with the new champions being crowned in a tournament in January which he would later win with Kazma Sakamoto. Later that month, Hulk, Sakamoto and Takashi Yoshida took part in the 2020 Ashiyanikki Cup 6 Man Tag Team Tournament. In the first round of the tournament, Hulk helped Eita, Ishida and Shimizu to defeat the Dragon Gate trio of YAMATO, KAI and Kzy, leading KAI to get his revenge and cost Hulk, Sakamoto and Yoshida's match against Ben-K, Strong Machine J and Dragon Dia.