The good folks of central city should watch their pockets when The Flash returns.

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Someone is darting around the Scarlet Speedster's hometown and soiling the Flash's (Grant Gustin) good name in the process. A female speedster will make her debut in "Trajectory," and her antics will have the entire city - and Iris' (Candice Patton) boss - down on their innocent hero.

"Deciding to blow off some steam, Barry and the team head out for a night on the town only to encounter an unexpected speedster who is up to no good," The CW teased. "Iris is challenged by an assignment from her new boss (guest star Tone Bell), and is surprised when friction turns to flirtation."

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It is currently unknown where Eliza Harmon, aka Trajectory, is from or how she obtained her powers. Canonically, the speedster is the product of Lex Luther's Everyman Project. Considering Luther isn't currently in The CW DC universe, STAR Labs will have to find a different explanation for Eliza's Speed Force connection.

As she busies herself separating citizens from their watches and wallets, Trajectory will rocket between friendly and menacing.

According to TV Line, Harmon is an "exceptionally bright scientist" with a "split personality a la Jekyll and Hyde."

Find out how Team Flash will lay Trajectory low when The Flash returns to The CW on March 22 at 8 p.m. ET.

Tags: The Flash television the cw