If you miss your called "Boarding Group" for Guardians of the Galaxy: Cosmic Rewind in 2026, the official policy is that late arrivals may not be accommodated. However, in practice, Disney Cast Members are often quite flexible if you arrive within an hour or two of your group's expiration, especially if you have a valid reason like a dining reservation conflict or a ride breakdown elsewhere. If you are significantly late, you should first visit a Guest Experience Team kiosk (identifiable by their blue umbrellas) to explain the situation; they have the "magical" ability to sometimes re-activate your pass or move you to a later group. If the ride is experiencing high demand or technical issues, they may be stricter. To avoid the stress, enable push notifications for the My Disney Experience app, as you only have a one-hour window once your group is called. If you miss it entirely and aren't accommodated, your only other option is to purchase an Individual Lightning Lane entry if any remain available, or try to join the second virtual queue drop at 1:00 PM if you are eligible.