Scott Lang (Paul Rudd) has been under house arrest for helping out Captain America in Berlin in Captain America 3. He has spent the time watching television, playing drums and learning close up magic. He also gets to spend some time with his daughter who visits him at weekends.

However Lang gets a weird vision and contacts Dr Hank Pym (Michael Douglas) who has been unhappy with him for rushing off to Berlin.

Pym and his daughter Hope Van Dyne (Evangeline Lilly) were doing some experiments to get hold of Pym's wife, Janet Van Dyne (Michelle Pfeiffer) the original Wasp. She was lost in the Quantum World for some three decades. The experiment Hank and Hope conducted was at the same time that Lang had his vision.

As they unite to free Janet from the Quantum World, some villains want to steal their technology and a new entity emerges called Ghost. The Ghost keeps phasing as its molecular structure is unstable and needs to absorb the energy from the Quantum World.

The film is a contrived mess as shown by the six credited writers. The stakes might be small scale in comparison to the other MCU movies. The tone more lighthearted and breezy. I did not expect the film to be so inconsequential and the action so repetitive. It really is a series of elongated set pieces to pad out the two hours running time as the script is so flimsy.