This ‘WandaVision’ leak paid off in the show and in ‘What If…?’

The most significant WandaVision leak so far revealed the true identity of a mysterious character.
Unlike other recent WandaVision leaks that turned out to be accurate, this leak was verified before Episode 8 aired.
The mysterious character was the person that Paul Bettany teased in interviews.

Back in March, everyone was awaiting the finale of WandaVision. Episode 9 then aired on Disney+, bringing us closer to the first MCU Phase 4 show’s finale. The episode was 50 minutes long, and, like Episode 8, stepped out of sitcom territory for good. The previous installments showed us one of the TV show's villains, with the action picking up fast. We also saw a brand new hero getting their powers, and we saw Vision getting his explanations for the world he’s been living in.

The final WandaVision episodes introduced us to at least one character that didn't leak. Paul Bettany, the actor who plays Vision, hyped that up in previous interviews. Elizabeth Olsen also had indicated that some surprises were in store for fans. Given that many WandaVision secrets leaked between episodes, it wasn’t a surprise that the mysterious character leaked before Episode 8. But they weren't entirely correct. Major spoilers follow below, so you should avoid them if you want to go into the final episodes unspoiled.