King Shark vs. Gorilla Grodd

Synopsis
When Gorilla Grodd attacks Central City, Barry and Team Flash find themselves teaming up with an unexpected ally to defeat – King Shark. However, when they hit a snag, they bring in Dr. Tanya Lamden to try to reach the man behind the shark, Shay Lamden.

Trivia

 * A fight between King Shark and Grodd was first referenced by Nora West-Allen in.
 * This was also subtly foreshadowed in the Season 3 episode ; after Grodd was defeated and mentioned to have been locked up at A.R.G.U.S., Caitlin stated that he can be thrown into the same cage as King Shark (who's also in A.R.G.U.S. custody) for all she cares, since any good in him is long gone. Cisco then stated that was a fight he'd pay money to see.
 * This episode marks the return of Tanya Lamden, who last appeared in.