Sergei is son of Weigen Ratsche, a famous wrestler who joined in WWE. Upon his resistance to follow his father's steps, Sergei hopes to create skills in his own. But Sergei's mother is half-blood earth mutant, Ophran Jaschke.

Oprhran died in mountains of Himalayas where earthquakes killed 50 trekkers alone in 1990.

Sergei is torn between his blood, human or mutant. But Orphran never registered as full-blooded mutant.

Sergei is instantly became famous in Eastern German at age of 5. His antics wrestling made him famous. His favorite skill was splitting sommersault. But what he did, he almost killed the opponent.

Weigen disappointed to his son, Sergei. He pointed out that his opponent is almost killed but diminished with fatal blow of splitting.

Sergei is now living with his grandparents in New Zealand at age of 6. His living there is quite unusual. He trained to be professional wrestler like his father, but his father wanted him to keep out of wrestling.

A massive earthquake came in 1995 when Sergei trained in Okinawa, Japan. He never felt died but born in his new techniques: earthquake, splitting fire and water and lifting/throwing ground rocks.

Japanese feared that earthquake might come back. When Sergei transferred to Western China, another earthquake came in 1995. He named himself as Rumbler.

He didn't know that he is one causing earthquakes alone in Japan and China. It led thousand people died alone in 1995.

When Sergei met his father again in June 1996, Weigen has been hospitalized and forgave his son before his father is dying in colon cancer. Three weeks later, his father died in July 1996. Sergei joined the ranks of Psychic's group, the anti-Fireice group who wants to destroy some good forces of mutants in 1997.

He also participated in the 1998 war where many people feared dying in millions.