Laga'aia is noted for his television roles, including Senior Constable Tommy Tavita in the Australian police drama Water Rats, lawyer David Silesi in the New Zealand legal drama Street Legal and Elijah Johnson in the long running Australian soap opera Home and Away.

[3] Laga'aia is known for his part on Australian children's TV show Play School, and also for his role as Captain Typho in the films Star Wars: Episode II – Attack of the Clones and Star Wars: Episode III – Revenge of the Sith.

Laga'aia narrated each of the characters on the children's show Larry the Lawnmower,[5] which ran for 2 seasons starting in 2008.

In November 2009, it was confirmed that Laga'aia had joined the cast of Australian soap opera Home and Away, as Reverend Elijah Johnson,[6] until February 2012.

He returned to the stage to play the role of The Wonderful Wizard of Oz in the 2013-14 New Zealand and Australia national tour of the acclaimed Broadway musical, Wicked.