The Flash showrunner Andrew Kreisberg reveals why Wally West (Keiynan Lonsdale) has been absent in season 4 and when he'll return. On The Flash, Wally West's time as a member of the team came to an abrupt end in the third episode of season 4 when the character announced that he was leaving Central City.
Wally West first appeared on The Flash in season 2 as the son Joe (Jesse L. Martin) never knew he had. As Wally developed relationships with the main characters, including Joe, his sister Iris (Candice Patton), and Barry (Grant Gustin), he eventually discovered Barry's secret and became jealous of his status as The Fastest Man Alive. Due to the events of Flashpoint, Wally gained super speed and became Kid Flash, assisting Barry on numerous missions to fight dangerous metahumans.
In an interview with TVLine, The Flash co-showrunner Andrew Kreisberg explained the reasons behind Wally's departure from the team, and teased the character's return. According to Kreisberg, having two speedsters had become a problem for the show, both financially and creatively.
There are a lot of times where either Barry had to get knocked out so Wally could save the day, or Wally had to get knocked out so Barry could save the day — and just knocking them out, that costs a lot.
Kreisberg adds that Wally is not "gone" from the Arrowverse or The Flash, and that the character will certainly return on the series, with plenty of "exciting stuff" ahead for the character. His next appearance will be in the seventh episode of season 4, which airs November 21.
Wally's decision to leave the team was a result of receiving a "break-up cube" from Jesse (Violett Beane) in the episode, "Luck be a Lady." After Team Flash dealt with the metahuman Hazard, Wally pointed out that the team didn't really need him, and decided to leave in order to take a journey for himself. The storyline ended up writing out not one speedster, but two, from the show. Apparently, Jesse now has a team of her own and doesn't have time for Wally or her father.
It remains to be seen what Wally's return in The Flash will bring, or if the character has a future in a different series, such as Legends of Tomorrow. It's possible that Kid Flash could work better in a series that doesn't currently have a speedster.
Season 4 of The Flash continues with "Girls Night Out" on November 7th, on The CW.