WandaVision: 5 Predictions For Who The Final Episode's Secret Cameo Is
3. Reed Richards
The leader of the Fantastic Four has been rumoured to show up in WandaVision ever since Monica Rambeau teased her mysterious aerospace engineer friend, though fans were disappointed when this was seemingly revealed to be Major Goodner instead.
However, there is no guarantee that Goodner was definitely the engineer herself. She dropped the vehicle off to Monica, and may have helped in the building process, but the actual engineer in question could still be revealed, and it could still very much be Reed Richards.
As far as geniuses in the Marvel Universe go, there aren't many smarter than Mister Fantastic, particularly when it comes to engineering. With Marvel's First Family confirmed to be coming to the MCU sooner rather than later, WandaVision would be the perfect opportunity to bring Reed in before the Fantastic Four movie itself, in a similar way to how Civil War introduced T'Challa and Spider-Man.
He wouldn't have to have a huge role in the finale, but after the previous two chapters have introduced post credit scenes to the series, episode nine's sting would be perfect. After heading to the Hex and tweaking his previously unsuccessful vehicle, all fans would need is a scene showing Reed reacting to the strange things happening to his body thanks to the CMBR exposure.