Kamen Rider W is a Japanese tokusatsu television series that premiered in 2009. It is part of the long-running Kamen Rider franchise and features a unique dual-hero concept, where two characters, Shotaro Hidari and Philip, transform into a single hero known as Kamen Rider W. They use a special device called the Double Driver to combine their powers and fight against the villainous organization known as Museum. The series is set in the fictional city of Futo, where the duo battles against various monsters called Dopants, who are created using a dangerous substance known as Gaia Memories. Each episode typically involves solving mysteries and uncovering the truth behind the Dopants, while also exploring the characters' backstories and relationships.