(Covers information from Anderson's universe)
"Nursery Zombie" was a clone create on Umbrella Prime.
"Nursery Zombie" was infected with the T-virus and implanted with Las Plagas, turning him into a Las Plagas Undead. He was activated for a Suburbia outbreak simulation, and was seen to chase Suburban Alice and Becky into a house, tracking them down to its nursery. Alice managed to throw him off the landing.
The Nursery Zombie is named by Paul W.S. Anderson in a commentary for Retribution, where he named "Trevor" and the "Trevor Zombie".