Ant-Man and the Wasp

Two years after Scott Lang was placed on house arrest due to his involvement with the Avengers in violation of the Sokovia Accords, Hank Pym and his daughter Hope van Dyne briefly manage to open a tunnel to the quantum realm. They believe Pym's wife Janet van Dyne might be trapped there after shrinking to sub-atomic levels in 1987. When he had previously visited the quantum realm, Lang had unknowingly become quantumly entangled with Janet, and now he receives an apparent message from her.