Heading into Phase 5 of the MCU, one of the most important films of Marvel Studios’ Multiversal narrative is Ant-Man and the Wasp: Quantumania. True to its name, this Ant-Man threequel is confirmed to not only revisit the Quantum Realm but also be the first MCU film to feature Kang the Conqueror. Even though Ant-Man and the Wasp: Quantumania isn’t set to release until February 17, 2023, Marvel Studios released a Quantumania trailer exclusively to D23 Expo attendees, confirming just who from the MCU has a part in this upcoming threequel.

In the D23 trailer for Ant-Man and the Wasp: Quantumania, audiences get an idea of Scott Lang’s post-Endgame life, as well as what the now-teenage Cassie Lang was up to during the Blip. Apparently, Cassie developed an interest in the Quantum Realm during those five years; and now, she’s developed a machine that acts as a sort of two-way radio with the Quantum Realm. In fact, she’s learned how to send a signal to the realm. Janet’s warning to Cassie turns out to be too little, too late as the Lang and van Dyne family end up in the Quantum Realm before coming face to face with the MCU’s next big bad, Kang the Conqueror.

While the Ant-Man 3 trailer begins by showing more of what fans have come to expect from the franchise, that all changes once the cast ends up in the Quantum Realm. The tone grows progressively darker; and by the time Scott meets Kang, it’s clear that this threequel provides the stakes prior Ant-Man films have never had. If there’s one complaint to be had with the footage, it’s Cassie’s creation of the device that can contact the Quantum Realm.

Until now, young Cassie never showed much interest in science. While it’s true that she’s a teenager now, her being the reason why they all end up in the Quantum Realm just seems convenient.

Hopefully, that part of the plot will be better executed in the film; but if not, Ant-Man 3 still has a ton to offer and looks to be integral to the MCU moving forward. Ant-Man and the Wasp: Quantumania debuts in theaters on February 17, 2023.