T-Rex Dopant

The T-Rex Dopant appeared in 2009 TV series called Kamen Rider W. T-Rex Dopant (ティーレックス・ドーパント Tī-Rekkusu Dōpanto) is the Dopant form assumed when one uses the T-Rex Gaia Memory. The only known user of the T-Rex Memory was Marina Tsumura (津村 真里奈Tsumura Marina), a woman who was was Yousuke Togawa's girlfriend and also Shotaro Hidari's childhood friend. Same as her boyfriend, she was also fired from her position as Windscale's top designer, and bought the T-Rex Memory with her boyfriend Yousuke to exact their revenge for both being fired. However, when Yousuke went berserk, Marina hired her childhood friend Shotaro to find Yousuke so she can kill him. Once Kamen Rider Double destroyed the Magma Memory, Marina used her Dopant form to abduct and murder Yousuke. After Shotaro learned the truth, Marina tried to kill him as she assumed the T-Rex Dopant form. After a brief fight, T-Rex Dopant then transformed into the Big T-Rex and led Double on a chase around the city. As Double, Shotaro destroyed the T-Rex Memory with HeatMetal's Metal Branding Maximum Drive and handed Marina over to the authorities.

In an alternate 2011 in which Shocker ruled the world with all the other evil organizations and monster races, the T-Rex Dopant, user unknown, was part of a band of Dopants that were fought by Kamen Rider Double when the Kamen Riders returned to fight Shocker.

The T-Rex Dopant was one of the monster souls, presumably the essence of the T-Rex Memory, which surfaced in the world within the Magic Stone. Appearing as Big T-Rex, it was part of an army of Amadum's strongest monsters which fought the 14 Heisei Riders, it was destroyed by the combined efforts of Double and several other Riders.

T-Rex Dopant
As the T-Rex Dopant (ティーレックス・ドーパント Tīrekkusu Dōpanto), the user can cause massive shock waves with its roars.

Big T-Rex
To assume this Big T-Rex (ビッグ・ティーレックス Biggu Tīrekkusu) form, the user must use debris to form a robotic T. Rex body to increase its powers while in default T-Rex Dopant form.