Toaru Kagaku no Railgun T Episode 21

Doppelganger (ドッペルゲンガー) is the 21st episode of Toaru Kagaku no Railgun T. It was broadcast on August 28th 2020.

Characters
By order of appearance:
 * Misaka Mikoto
 * Hazamaya Kana
 * Indian Poker Merchant (flashback)
 * Kinuhata Saiai (flashback)
 * Shokuhou Misaki
 * Shirai Kuroko
 * Uiharu Kazari
 * Konori Mii
 * Yanagisako Aomi
 * Tessou Tsuzuri (cameo)
 * Yomikawa Aiho (cameo)
 * Keitz Nokleben
 * Kouzaku Mitori
 * Dolly
 * Tokiwadai Dorm Supervisor (mentioned)
 * Kuriba Ryouko
 * Accelerator (fantasy)

New Characters

 * Doppelganger
 * Chief
 * Leader
 * Yakumaru
 * Naru
 * Seike
 * Scavenger Liaison

Abilities

 * Mental Out - Shokuhou Misaki, Level 5
 * Electromaster (Railgun-variant) - Misaka Mikoto, Level 5
 * Liquid Shadow - Kouzaku Mitori, Level 4

New Abilities

 * Predator - Leader, Level 3

Locations

 * Academy City
 * School District 7
 * Judgment 177 Branch Office
 * School Garden (flashback)
 * Tokiwadai Dormitory
 * School District 20
 * Shinasame University DNA Map Analysis Laboratory

New Locations

 * School District 13
 * Learning Core (mentioned)

Referbacks

 * Mikoto once again remembers her with Misaki at the beginning of the episode.
 * A scene from  is used as a flashback when Mikoto noticed that the merchant had disappeared from his usual place.
 * The information leaking from the School Garden that Kazari reports was previously mentioned in Toaru Majutsu no Index Light Novel Volume SS.
 * The Shinasame University DNA Map Analysis Laboratory is one of the facilites of the Level 6 Shift Project that Mikoto destroyed via cyber hacking back in .
 * Scavenger refers to their  on eliminating DA, in which they  due to Accelerator's intervention.

Differences in Adaptation

 * Given the state of Uiharu's arm in this episode, the meeting in Judgment 177 Branch Office takes place after the events of October 9th, unlike in the manga where Uiharu's arm seems normal, thus taking place before October 9th.
 * In relation to the statement above, the meeting in the manga is much longer than the adapted episode, especially where they explained further the machines that creates Indian Poker cards.
 * Both Kouzaku Mitori and Dolly appeared in person in this episode, donning their attires for their appearance in the Jailbreaker Arc, unlike the manga where Mitori's mini Shadow Puppet only appeared alongside her voice.
 * The scene of Mikoto and Kuroko inside the dorm before the former infiltrates facilities is anime-original.

Animation Trivia

 * On Scavenger's appearance at the end of this episode, the ending theme plays over it, which resulted on the ending animation being replaced.