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Casey was the alien conductor of the Cross-Time Express, a vehicle operating on the Cross-Time Central Express Railroad. Huge fans of terrestrial railroads to the point of calling them the best vehicls in the entire Omniverse, Casey and his crew designed their equipment and uniform to match those. While operating for the Time Variance Authority, Casey helped the Fantastic Four escape the Minutemen and Justice Peace through the time-stream, delivering them to their relative present on Earth-616. As a price for his services, Casey took their Unstable Molecules uniforms, the fabric of which was valuable as contraband among train fanatics.