Billy Cranston is a fictional character in the Power Rangers universe. He is the Blue Ranger in the series Mighty Morphin Power Rangers, and was portrayed by actor David Yost. Billy is the only original Power Ranger to remain for the entire MMPR series, and is the second longest-serving Ranger overall behind Tommy Oliver. Until his departure, he was considered the brains of the Power Rangers team, creating many gadgets with which to solve problems that not even Zordon foresaw, and he even invented the first team's wrist-worn communication devices. A reimagined version of Billy (now black with black hair with a closer friendship with Jason Scott) appears in 2017 reboot film, played by actor RJ Cyler. Character history Television Mighty Morphin Power Rangers Billy was one of the five "teenagers with attitude" selected by Zordon to become the original Power Rangers, along with Jason Lee Scott, Zack Taylor, Trini Kwan and Kimberly Hart. Billy became the Blue Power Ranger and was given both the Triceratops Power Coin and the Triceratops Dinozord. Billy began the series as the stereotypical "nerd." The other Rangers, especially Trini, defended him loyally, but Billy later evolved to become a stronger individual. He was one of the top members of Angel Grove High's science club and often helped its younger members with their experiments. One such example was with Willy, a young boy he helped to create a virtual reality simulator for a Science Fair. In the episode "High Five," Billy created not only the wrist communicators the Power Rangers used, but also the interface that allowed the devices a remote access to the Command Center's teleportation unit. It was revealed that, due to an experience in his youth when he was bitten by a fish during an experiment involving whirlpools, Billy developed icthyophobia: fear of fish. This fear would affect him well into his teens, and Rita would use a spell to exacerbate this fear. When he is the last Ranger left able to contend with the Goo Fish monster, Billy overcomes the spell and then, after helping to free his friends and defeat the monster, completely overcomes the fear itself on a fishing trip with Ernie, the owner of the Youth Center. Each of Billy's teammates have a unique skill to offer the team and, in Billy's case, it was his vast intelligence. He sought out to improve himself physically, and the audience