Craig Carvahlo Medeiros is the founder, lead singer and bassist of Thrash Metal band: Nuklear Intoxikation. His current bandmates are his sister Makayla and his friend Kurt. The three of them live together as housemates. Craig and his sister, Makayla, grew up in MountainSide and moved to Selene Valley in their teens. They have always been close to each other. Growing up, they were a duo of pranksters. Craig and Makayla both have strong personalities and tend to clash at times, especially when Craig takes things too far and when he drinks the poison of his toxic girlfriend, Veronika, or their father, Leon.

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Growing up, Craig was conditioned by Leon, to be the way he is and is blind to his toxic influence. He is constantly trying to seek his approval and trying to please him. Craig went through a reckless and troublesome phase as a teenager and started bullying others, which continued into his adulthood. Although Craig likes to dish it out, he can't take it. He loves to make jokes at others' expense, but the second you turn it on him, he loses his cool.

Craig first met Veronika at one of his shows and the two developed a relationship together, bonding over their love of Thrash metal and sports. Veronika seemed like a breath of fresh air and different from his rival ex-girlfriend, Jaclyn Kovalenko... or so he thought. Craig and Veronika have a toxic relationship, the two of them constantly argue. Veronika is constantly criticizing Craig for not being "Manly" enough and mocking his moments of vulnerability. She is not much different from Jaclyn, whom the two have a rivalry with, constantly trying to destroy each other.

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Craig is still in love with his ex-lover and former guitarist, Andreas Odegaard. However, the damage is too far done for Andreas and he doesn't wish to reconcile with Craig. Veronika constantly begs Craig to fill Andreas' place in the band or to kick Makayla out, but Craig refuses her until she breaks up with him and he finally relents because he can't stand to be alone. This ruins his relationship with Makayla and dooms the band as he replaces Makayla with Veronika on the lead guitar. Veronika can't play guitar to save her life and the whole band falls apart.

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