In the fourth episode of WandaVision, Jimmy Woo tells Monica that the FBI sent an agent into Westview who never came out, sparking their interest in the town and leading to its investigation.
I heard that there was a rumor that fake Pietro/Ralph was meant to be that missing agent, but that never got fully delved into because an episode of the show was cut due to COVID. Do we know who this agent was supposed to be?
Firstly, it was a missing person from the witness protection program not an FBI agent. And then it wasn’t that SWORD had their interest sparked, it’s that the FBI asked for their involvement so they could make use of their tech.
Hayward: The FBI is in a tizzy over a missing persons case up in Jersey...
Monica: "Missing persons"?
Hayward: I know. But they have requested use of one of our imaging drones, and I need a chaperone.
WandaVision, Season 1 Episode 4, "We Interrupt This Program"
Woo: I've got a witness set up down the road in Westview, and this morning, it looked like he flew the coop.
Monica: Your missing person is in the Witness Protection Program?
WandaVision, Season 1 Episode 4, "We Interrupt This Program"
We never found out who that person is in the series and as far as I know we still don’t know. In fact director Matt Shakman has said in an interview with ComicBook.com that the person is potentially going to be revealed in a future project.
"In terms of nobody knowing that Westview exists, Westview does exist and that's why Jimmy’s there. But the people in the environment have forgotten it because Wanda has made it so," Shakman told ComicBook.com's Phase Zero podcast about the "Hex" spell cast by Wanda Maximoff (Elizabeth Olsen). "She's created a kind of black hole there so she can be uninterrupted and people won’t find their way in too much. In terms of the missing person, there's an answer for that and, you know, hang in there."
When ComicBook.com asked Park if the identity of Woo's missing person would be revealed at a later date, he answered: "That's a good question. That's a good question that I will just leave a question."
As revealed in another answer, the character was a missing person from the witness protection program rather than an FBI agent. This detail is clarified in a deleted scene from the WandaVision series finale (S01E09, "The Series Finale"), which reveals that the missing person was Ralph Bohner (played by Evan Peters).
The scene, which appears in the "WandaVision - Exclusive Deleted Scene" video released by IGN in 2023, shows Jimmy Woo discussing the witness with another FBI agent:
Let's keep an eye out for a missing witness. We still need him to testify. Should be easier to spot now that everything's back to normal.
Following this exchange, we see Ralph sneakily taking a bolt cutter from a fire truck and using it to remove his ankle monitor, confirming his identity as the missing witness.
