Who's This? Next in Forgotten Villains Week, Kraklow, the old wizard in the purple robes.
The facts: An 18th-century Polish wizard (hence the name that sounds like a Polish city), Kraklow's only pre-Forgotten Villains appearance is in Rip Hunter... Time Master #28, but at least it's a full-length story.
How you could have heard of him: Like the Atom-Master, he only then appeared in DC Comics Presents #77-78 and Resurrection Man #25.
Example story: Rip Hunter... Time Master #28 (Sept.-Oct. 1965) by George Kashdan and Will Ely
Back in time, Rip's time sphere is attacked by monsters created by the nefarious Kraklow. He explains his modus operandi:
Being from the past, you wouldn't have expected Kraklow to ever appear again, so it's a small miracle that he was added to the Forgotten Villains' roster, making a clay statue to turn Superman into a monster, and brainstorming with his team as a magic hologram beamed from the 18th-century. But DC Comics Presents often proved to be that brand of crazy.
Who else? THREE down, TWO to go, as Forgotten Villains Week continues!