After a one-month hiatus, CW's The Flash returns this week with "Out of Time" on Tuesday, March 17, which the new trailer revealed will focus on Barry Allen (Grant Gustin) travelling back in time to track down Reverse Flash, who killed his mother when he was just a child. The cast and crew attended a panel at PaleyFest over the weekend, where executive producers Greg Berlanti and Andrew Kreisberg revealed that they plan on introducing Wally West's story line in Season 2. Here's what Andrew Kreisberg had to say, revealing that an upcoming episode will help set the table for Wally's arrival, and teased the fate of Joe West's wife.

"There's an amazing scene in an upcoming episode where Tom and Jesse discuss that."

Barry is still unaware that Tom Cavanagh's Harrison Wells is Reverse Flash, but the producers teased that Barry will eventually learn the truth about his mentor. While he wouldn't share an concrete details about Reverse Flash's plans, Tom Cavanagh cryptically stated that his character just wants to go home.

"Harrison Wells is just a guy who wants to get home."

Since Barry uses time travel in next week's episode, Andrew Kreisberg teased that the show will also explore the ramifications of going back in time.

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"We're definitely talking about the ramifications of time travel. There are episodes coming up where there is concern of certain events being changed in the past [that] would affect who people are and their relationships with each other. If the past changes, does the present change as well?"

Rick Cosnett, whose character Detective Eddie Thawne was originally thought to be Reverse Flash, since he has the same Thwane surname as the villainous character from the comics, teased that fans will be surprised by where his character goes in upcoming episodes. The PaleyFest audience was shown a new trailer where Eddie is seen shooting two fellow cops at point-blank range, which may be a result of Barry's time travel. Here's what the actor had to say below.

"Eddie has an amazing arc over the season and you're going to be so surprised."

Candice Patton, who plays Joe West's daughter Iris West, revealed that she will eventually figure out that Barry Allen is The Flash.

"I can only imagine that when she finds out Barry and Joe [Jesse L. Martin] have been lying to her, it's going to be a huge sense of betrayal. That's at the base of everything. How could your family... keep something so big from her? It's going to change everything."

What do you think about these new details? Are you excited that Barry will learn the truth about Harrison Wells, and Iris will learn about Barry's dual identity? Chime in with your thoughts below, before The Flash returns with "Out of Time" on Tuesday, March 17 on The CW Network.