Wallace Krebs is an American amputee actor who portrayed a walker on AMC's The Walking Dead, in "Clear" in Season 3. He also played a prison survivor in "Isolation" in Season 4. Wallace created a backstory for his prison survivor role: He has appeared in the following episodes: Season 3 * "Clear" - Zombie attacking Michonne's car as it gets stuck in mud. Season 4 * "Isolation" - In Cell Block A, dead with amputated arm, put down by Dr. S before reanimation.