Dr . Fudo Dr . Fudo was Yusei Fudo ' s father and the husband of Mrs . Fudo , whose spirit had dwelt within the old Ener - D Reactor . Personality . Dr . Fudo ' s personality was much like his son , Yusei ' s . He was also described as very strict by Yusei . Biography . He was the lead developer within R . R . D . ' s Ener - D Reactor who was killed in the Zero Reverse . His leading position of R . R . D . was due to the fact that he was the leader behind the research into the " Planetary Particle " , which 17 years ago was the particle needed for the development of the Ener - D technology . This research consisted on the planetary gear which was one that was able to bind particles to others . Dr . Fudo named his son , Yusei Fudo , in honor of this particle , which was named Yuusei Ryuushi , as he wanted his son to be able to bond people together . Rex Goodwin mentioned him just before Yusei and the others were about to travel to Satellite aboard a helicopter . He told Yusei that he and Roman Goodwin , Rex ' s older brother , were Dr . Fudo ' s head assistants . Later on , Roman told Yusei and the others that Professor Fudo wanted to cancel the Ener - D research , as he already suspected that its rotation was quite unstable . Furthermore , he realized that there might be an accident ( as it happened , he was right ) . However , its proposed cancellation was rejected by the City , which caused Professor Fudo to be removed from the project and replaced by Roman instead . Soon after , Roman overrode the system which lead to the Zero Reverse incident . Dr . Fudo ' s last act was to save his infant son , Yusei , by ejecting him from the Ener - D development area in an escape capsule immediately before he was killed by the negative energy explosion . ( In the English version , he had disappeared before the Ener - D reactor had begun to malfunction , which had released all negative energy ) . Later on , Mina Simington revealed to the Signers that Yusei ' s father had entrusted the " Red Dragon Archfiend " , " Stardust Dragon " and " Black Rose Dragon " cards to Goodwin , so that their correspondent Signer could seal the control units of the Ener - D reactor . She said that he obtained them from Roman , immediately after he was released from the project . When Roman showed the four dragon monsters to Professor Fudo , including " Ancient Fairy Dragon " , Dr . Fudo took them and ran . However , he was attacked during his flight , so he dropped Ancient Fairy Dragon , similarly to how Uru had dragged the dragon down with it as the spider was sealed in the Nazca Lines . Dr . Fudo made a brief appearance in the Underworld during the events of Episode 58 after Yusei fell into the light of the Original Ener - D Reactor . He saved Yusei , and brought him to a river in the Underworld . ( This is thought to be Sanzu River , a river that is thought to be the gate to the Underworld in Japanese mythology . ) There , he asked Yusei for his forgiveness , as he had burdened his son with a heavy destiny . As he faded away , Dr . Fudo reminded Yusei that there were people that were waiting for his return . Yusei tried in vain to follow and talk to him some more . Unfortunately , his father disappeared , and Yusei returned to the Ener - D Reactor , unconscious , though he quickly awoke . Later , in Episode 117 , he made a brief appearance as Yusei and Bruno traveled through Dimensions by using Infinity . There , he talked about how Ener - D had destroyed the world , before sending them back to their time . Later at the end of that episode , Yusei came to a realization about his father . In episode 128 , Yusei stated that Dr . Fudo might still be alive , but trapped inside the Ener - D . He appeared in Episode 138 , when Yusei decided to risk his life in order to prevent the Divine Temple from destroying New Domino City . In Episode 150 , Yusei fell off his Yusei Go during his Duel with Z - one , and a beam of light from the Ener - D reactor stretched out to him as he fell . Inside a void of space , Dr . Fudo appeared before his son , encouraged him to continue fighting and physically struck him to get him back on his feet . Dr . Fudo told Yusei that as the Planetary Gear does , Yusei connected the hearts and the feelings of others , and that was his role now . As Yusei got up , Dr . Fudo vanished , and said this was the last time he could appear to Yusei . Yusei reappeared in the real world , and was still falling , when the Yusei Go drove down of its own accord to catch him . Yusei attributed this act to his father and thanked him before he continued the Duel . During Jack and Yusei ' s Duel , Yusei mentioned his father and brought his friends and himself to tears . Abilities . Following his death during the Zero Reverse , Dr . Fudo ' s spirit remained in the Old Ener - D , and appeared several times to Yusei , who helped and inspired him to not give up . He had the ability to somehow manipulate time , as shown in Episode 117 , when he sent Yusei back to his own time . In the same episode , he showed that he was also knowledgeable of what the Divine Temple was .