WandaVision Episode 7: 5 Biggest Talking Points
3. Pietro Is Under Agatha Harkness' Spell
Speaking of Agatha Harkness, she seems to be controlling more than one of the Maximoffs.
Pietro did not appear in this episode - until the credits began to roll - and it became clear to the audience that Harkness has him under her spell, as well. In a brief clip, we saw Pietro's arrival at the Maximoff household from another point of view. It appeared as though Agatha was controlling the speedster when he arrived, using him as a pawn to manipulate Wanda.
Whether he is an irrelevant figure that Agatha is using to push Wanda to the edge, or she has actually somehow found the X-Men's Peter Maximoff and is controlling his mind, one thing is clear: he is not to be trusted (for now, at least).
In the episode's mid-credit scene, Pietro spots Monica Rambeau as she is sneaking around the outside of Agatha's house and he appears to have a purple glow in his eyes - suggesting that he is still under Harkness' influence.
Wanda also appears to be beginning to realise that everything is not what it seems, as she tells her sons: "that man is NOT your uncle". This suggests that Wanda is suspicious of Pietro, possibly due to the fact that his mind is under the control of Westview's second witch.