The January 23 episode of The Flash is called “The Elongated Knight Rises” and it’s not a stretch to assume that this episode features Ralph Dibny (Hartley Sawyer!)
Here’s how the network describes it; hopefully we’ll have some photos soon.
THE RISE OF THE HERO — When a familiar villain returns to terrorize Central City, Ralph (guest star Hartley Sawyer) must rise up to defend the innocent while Barry (Grant Gustin) is detained by his trial. Meanwhile, Barry searches for the strength to keep his optimism alive in the face of his new circumstances. Alexandra La Roche directed the episode written by Sterling Gates & Thomas Pound (#411). Original airdate 1/23/2018.