Eva appeared frequently throughout Season 8.
She was portrayed by Anna Williams.
At some point Eva Greer became infected with meteor rocks and gained the ability to shape-shift through illusions. She then became the executive assistant to the new LuthorCorp CEO, Tess Mercer.
Eva delivered a gift to Tess from Oliver Queen. She opened the box which contained a green dress along with an invitation to dinner that night at the Ace of Clubs. Tess playfully declines the offer and Eva left before Maxima entered and attacked Tess.
At the Daily Planet, Tess and Eva discuss the e-mail from the person who stole the Crystal of Knowledge. Eva tells her that they were unable to find the IP address, and that the message was sent from a ghost router that disappeared as soon as they saw it.
She suggests that it could mean Lex was in fact still alive. Tess then informed Eva that unless she did find it, she would lose her job.
Eva went to visit Randy Klein in jail and confronted him about his confession of killing all of the recent victims. It was revealed that he had not killed them because there was video footage of him in an arcade during the time of the murders.
It turned out that he only wanted to be in the news and she offered him the chance to be part of Tess' team of heroes she was putting together.
Tess had Eva assume the appearance of Chloe Sullivan to get Clark Kent’s attention. Screaming for help, Chloe/Eva ran into the dark forest, as Clark managed to hear her from the Daily Planet. He rescued her from an incoming semi truck. Chloe/Eva was taken to the Kent Farm to be taken care of.
Chloe explains that she and Davis were staying in a motel, but Davis wouldn't let her leave. When they left and stopped at a gas station, she ran away. However, Chloe said that even with Clark, she doesn't feel safe. She tells Clark that he needs to destroy Doomsday.
Later Eva as Chloe saw Clark remove the crystal from its hiding place. He explained that he plans to save Davis and wasn't going to tell her until afterward. "Chloe" insists she was wrong when she stopped Clark from doing that earlier, but Clark insists the plan will work and he needs to find the last bit of good in Davis to save.
They then went to a garage in Granville where Emil Hamilton discovered two corpses that were both meteor-infected and hunting Doomsday. However, he points out that Livewire was killed by a small, temporal-lobe GPS implant that exploded and was triggered by whoever planted it.
Chloe seemingly panics and says she's going outside, overriding Clark's concerns. Outside, Chloe calls Plastique and meets with her and Parasite. Eva as Chloe discuss what happened with Neutron and Livewire.
They confirm that Livewire was alive when they left, but Chloe warns that Tess may be lying to them. Parasite and Plastique defend Tess, but Eva wonders if Tess chipped all of them, including herself, when they were at Black Creek.
At Isis, Chloe is going over photos when Clark arrives to ask why she left without telling him and ignored his calls. Chloe apologizes, but Clark wonders if he can trust her and asks what's going on.
She tells him of a team that Tess was putting together. One of them is Eva Greer, Tess's assistant who was meteor-infected and who Tess betrayed.
Before Chloe can say anything further, Chloe clutches her head in pain and collapses to the floor and dies. Clark is grief-stricken over his friend's death, but then 'Chloe' transforms into Eva, and he calls in Emil, who explains Eva was a shape-shifter.
However, she managed to relay all the Kryptonian information that Clark shared to Tess.
- Eva shares a last name with Tina Greer who was also a shape-shifter.