Kiwi donned their best Star Wars, Star Trek, Pirates of the Caribbean and Game of Thrones garb yesterday as the country's biggest pop-culture expo swung into life.

Thousands flocked to the ASB Showgrounds in Auckland for the Armageddon expo, which features comics, gaming and international stars.

Christopher Lloyd - who featured in the Back to the Future trilogy, The Addams Family, Who Framed Roger Rabbit, Taxi and Star Trek 3 - is the major attraction at the four-day event which winds-up tomorrow.

Today's action sees Lloyd part of a special Back to the Future panel on the main stage at 1pm, while tomorrow's panel includes James and Oliver Phelps, who played Fred and George Weasley in the Harry Potter movies.

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The expo also crown New Zealand's best costume dressers, with the annual Cosplay Cup to be decided.

Cody Heap as the Green Lantern.
Cody Heap as the Green Lantern.
Theo Tunley as Ted David ODST.
Theo Tunley as Ted David ODST.
Jerina Grewar dressed as a Hunter from Destiny.
Jerina Grewar dressed as a Hunter from Destiny.
Amy Cammish as Harley Quinn.
Amy Cammish as Harley Quinn.
Shingo Tokugawa dressed as Ars Da Vinci.
Shingo Tokugawa dressed as Ars Da Vinci.
Dante Jerwais dressed as Captain Jack Sparrow.
Dante Jerwais dressed as Captain Jack Sparrow.
Ethan Williams dressed as Lord Saladin.
Ethan Williams dressed as Lord Saladin.
Chris Williams dressed as the Fallen Captain from Destiny.
Chris Williams dressed as the Fallen Captain from Destiny.