Awesome! The Atom Rewards introductory offer of "See 4 movies, earn a free standard ticket" ended on December 31, 2018. Only members who saw their first qualifying movie on or before December 31, 2018 are eligible to earn a free movie ticket under the Atom Rewards offer.
If you saw your first qualifying movie before December 31, 2018 you'll receive an e-mail/notification when you've earned a free ticket. This can take up to 4 hours after your fourth movie has ended.