At a panel for "The Flash" at San Diego's Comic-Con International, it was revealed that classic DC Comics villain -- and non-speedster -- Doctor Alchemy will be making his debut in the third season as a villain.

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"We're doing two big bads. One is a speedster, and the other is Doctor Alchemy," "The Flash" producer Todd Helbing revealed at the panel.

In the comics, Doctor Alchemy is a scientist with multiple personality disorder who harnesses the ability of transmutation -- kind of like Firestorm -- using it to wreak havoc on humanity. He's made appearances on various DC Comics-based animated series, and most recently showed up in Geoff Johns, Doug Mahnke and Ivan Reis' "Justice League" #30.

There's no word yet on which episode we'll first see Doctor Alchemy.

"The Flash" returns Tuesday, October 13, at 8pm ET, on the CW.

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