See if you can correctly answer today's mentalfloss.com Brain Game Tuesday Test Time challenge. Good luck!

As of the end of 2011, only ONE
film series has TWO films that have
grossed more than $1 billion worldwide.

Name this film series
(and, if you can, the two films).

Here is the ANSWER.

THE ANSWER:

PIRATES OF THE CARIBBEAN.

The two films are Pirates of the Caribbean: Dead Man's Chest (2006) and Pirates of the Caribbean: On Stranger Tides (2011).