The CBBC sci-fi drama - created by Doctor Who writers Russell T Davies and Phil Ford - will resume production next month at Cardiff's Roath Lock Studios.
Scott Haran and Percelle Ascott star in the children's drama as Tom Clarke and Benny Sherwood - a young wizard and his brainy best friend who battle the alien Nekross.
"CBBC is the home of thrilling and inspiring drama for children and Wizards Vs Aliens is a perfect example of that," said Cheryl Taylor, Controller of CBBC.
"The series is vivid and brave and our audience loves the portrayal of loyal friendship alongside exciting alien battles and stunning wizardry.
"Children want to talk about Tom, Benny and the Nekross and we know they'll be delighted to hear a third series is being conjured up by the talented team in Wales."
The third series of Wizards Vs Aliens will air in late 2014 or early 2015.
Wizards vs Aliens to make US debut on The Hub
Watch a clip from Wizards Vs Aliens below: