"I hit Mon-El. Hard. We... we were training, and I was frustrated 'cause I wasn't getting it, and-and then he brought up our past, when I used to train him, and that's when the rage set in."
Kara Danvers
"In Search of Lost Time" is the fifteenth episode of the third season of Supergirl, and the fifty-seventh episode overall. It aired on April 23, 2018.


When M'yrnn inadvertently causes psychic disturbances at the D.E.O., Supergirl must work with J'onn to contain the resulting chaos. Meanwhile, Mon-El begins training Kara in fighting techniques he's learned in the future.[src]


  • J'onn having had an imaginary friend from a parallel dimension named "Zook", a reference to the DC comic book character that appeared in comic books published by National Periodical Publications (now known as DC Comics) in the 1960s. He was the partner of the superhero J'onn J'onzz, the Manhunter from Mars (now known as Martian Manhunter).
  • The title is a reference to the volumed novel of the same name by Marcel Proust.
  • Winn attempts to act out the 1989 film The Cook, the Thief, His Wife & Her Lover during charades, only for M'yrnn to read his mind.
  • Kara quotes her uncle Jor-El, "The son becomes the father, and the father, the son", a line spoken by the character in the 1978 film Superman.
  • Upon seeing Kara successfully use cape tricks, Mon-El quotes Star Wars by saying, "The student becomes the master."


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