Wondering why there was a sky-written "X" above Auckland this morning?

Don't be alarmed, but it was a sign of the Apocalypse.

The aerial smoke layed by a vintage Harvard trainer was part of a marketing campaign for superhero movie X-Men: Apocalypse which starts at New Zealand cinemas on May 19 - a week ahead of the US release on May 27.

The new film completes a prequel trilogy which began with X-Men: First Class.

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It's effectively the second X-Men movie of 2016 after spin-off Deadpool became a box office hit early in the year.

This week also sees the release of another Marvel comics film with Captain America: Civil War opening in cinemas on Thursday.