Viper is an outgoing and charismatic biker who was treated at Seattle Grace Hospital.
Viper was admitted to Seattle Grace Hospital with bicycle spokes in his side as a result of a bike race. Alex pulled the spokes out and Meredith grudgingly sewed him up. He was advised that because Meredith wanted to run more tests, if he left, it'd be against medical advice, meaning he'd have to sign a paper, which he did. The following day, he was re-admitted when his stitches had torn apart, his skin was swollen, and he began to cough blood. He went into surgery, but afterwards, he was fine, much to the relief of a group of his waiting friends.
Viper flirted with Meredith in the ER and even kissed her, but he knew she wasn't interested in him.