After intercepting a faint, strange radio message, intrepid youngster Sean (Josh Hutcherson) has become convinced that it is from his explorer grandfather, Alexander (Michael Caine). With the help of stepdad Hank (Dwayne Johnson) he deciphers the code in the broadcast, which points to a magical remote island in the most dangerous, unexplored area of the ocean.
Disbelieving but desperate to bond with his stepson, Hank decides to finance an expedition to find out if the mythical location exists. With father-daughter guide team Gabato (Luis Guzmán) and Kailani (Vanessa Anne Hudgens) joining them, they set off on a voyage of discovery, uncovering giant insects, tiny elephants and mythical secrets along the way.
The plot of this loosely connected sequel to 2008's Journey to the Centre of the Earth contains more holes than a mole infested golf course, but these inconsistencies can be easily ignored thanks to the vibrant, thriving production design. The 50-foot iguanas, lost cities and exotic fauna will be to today's kids what the Swiss Family Robinson treehouse was to children of the 1960s.