Cliff Carmichael

Cliff Carmichael is a recurring adversary of Firestorm, known for his transformation into the villain The Thinker. Initially a high school peer of Ronnie Raymond, Cliff's bitterness led him to adopt a criminal identity using advanced mental technology called the "Thinking Cap." He has appeared in various storylines where he challenges Firestorm's control and has been involved with the Suicide Squad, where his betrayal led to his demise. Cliff's character is defined by his intellect and vendetta against Ronnie rather than physical prowess.