Although CW's The Flash Season 3 was certainly darker than its predecessors, Grant Gustin -- who plays the character -- noted at the most recent Comic-Con International in San Diego that his character would be more lighthearted in Season 4. Executive producer Andrew Kreisberg has also promised a more optimistic version of the series, which the upbeat and funny newest trailer for the show certainly captures.
The footage shows that working together on Team Flash will require Barry Allen (Grant Gustin) and Iris West (Candice Patton) to attend couples therapy, though the scene is definitely more humorous than one might first expect. The trailer also shows Danny Trejo as Breacher and Neil Sandilands as The Thinker/Clifford DeVoe.
It's possible that some or all of the scene showing the two at couples therapy will take place in the next episode, as the official synopsis reads:
BARRY AND IRIS GO TO COUPLES THERAPY — Barry (Grant Gustin) has his hands full when he takes on a dangerous meta (guest star Dominic Burgess) who can control technology, while also confronting an obstacle in his personal life: the ramifications of abandoning Iris (Candice Patton) for six months to balance the Speed Force. Meanwhile, Gypsy (guest star Jessica Camacho) breaches in for a hot date with Cisco (Carlos Valdes), but she gets annoyed when his work keeps them apart.
Starring Grant Gustin as the Scarlet Speedster, The Flash airs Tuesdays at 8 p.m. ET/PT on The CW. The series also stars Jesse L. Martin, Tom Cavanagh, Carlos Valdes, Candice Patton, Danielle Panabaker, Keiynan Lonsdale and more.