4x4 - Superboy

Lana goes to investigate reports of a ghost in a family's basement. What she finds is a little girl. But this is no ordinary little girl. She quickly slaps a device on Lana's neck and through it and an identical device on her own neck, she transforms herself into an exact duplicate of Lana. She reveals that she is an alien from a world where the beings have no identities of their own. They take the identities of others to survive. The alien has Lana's physical appearance, but not her memories. So she activates the device once again to transfer Lana's knowledge and memories to herself. The device malfunctions, however, and the connection is broken before the alien can absorb all of Lana's memories. She does catch a glimpse of Superboy, however, and wants to get closer to him so she can take his identity and his powers. The alien heads to the Bureau and convinces everyone there that she is really Lana. She then returns to the basement to finish Lana off.