What Can Be Spoken By the Irregular Dead?

What Can Be Spoken About the Irregular Dead? (不揃いの死者たちはなにを語るのか) is the twenty-first episode of Kamen Rider Drive. It is the debut of Mashin Chaser's Triple Tune form. Also, a glimpse of Drive Type Formula is seen near the end of the episode.

Synopsis
Simultaneous murders are going on, and Chase keeps popping up in surveillance tapes. While Kiriko and Shinnosuke believe in Chase's innocence, Go does not. But what is really going on?

Plot
to be added

Cast

 * Shinnosuke Tomari (泊 進ノ介): Ryoma Takeuchi (竹内 涼真)
 * Kiriko Shijima (詩島 霧子): Rio Uchida (内田 理央)
 * Chase (チェイス): Taiko Katono (上遠野 太洸)
 * Go Shijima (詩島 剛): Yuu Inaba (稲葉 友)
 * Jun Honganji (本願寺 純): Tsurutaro Kataoka (片岡 鶴太郎)
 * Rinna Sawagami (沢神 りんな): Rei Yoshii (吉井 怜)
 * Kyu Saijo (西城 究): Kenta Hamano (浜野 謙太)
 * Genpachiro Otta (追田 現八郎): Taira Imata (井俣 太良)
 * Narration (ナレーション), Drive Driver's voice (ドライブドライバーの声): Chris Peppler (クリス・ペプラー)
 * Brain (ブレン): Shota Matsushima (松島 庄汰)
 * Heart (ハート): Tomoya Warabino (蕨野 友也)
 * Medic (メディック): Fumika Baba (馬場ふみか)

Guest cast

 * Eyewitness: Takuma Maruyama (丸山 拓真)
 * Police: Hiroyuki Tanaka (田中 宏幸)
 * Dead Body: Kenta Nitta (新田 健太)

Shift Cars & Signal Bikes

 * Car Used:
 * Type Change: Shift Speed, Shift Technic, Shift Wild, Shift Deadheat, Shift Formula
 * Tire Exchange: Dimension Cab, Burning Solar (by Chaser), Funky Spike (by Chaser)
 * Type Used:
 * Type Speed, Type Speed Cab, Type Technic, Type Wild, Type Dead Heat, Type Formula
 * Bike Used:
 * Form Change: Signal Mach, Shift Deadheat
 * Signal Exchange: Signal Kaksarn (in Zenrin Shooter)
 * Form Used:
 * Mach, Deadheat Mach
 * Viral Core Used:
 * Chaser Spider, Chaser Bat, Chaser Cobra
 * Tune Form Used:
 * Tune Chaser Spider, Triple Tune

Errors

 * to be added