The Flash 4x22 “Think Fast” Season 4 Episode 22 Extended Promo (Fan-Made) - With the speedforce in jeopardy and Barry (Grant Gustin) starting to lose all hope in taking down The Thinker (Guest Star Bethany Brown) once and for all. he becomes desperate and turns to all those connected to the speed force for help. the good, and the Bad. Iris (Candice Patton) goes shopping. Fan-Made Song: Will Cookson- Alone in the Dark DISCLAIMER: I don’t own any images or music used in this video.