They Came From The Attic is an independent horror film shot in May 2007 Ladner, BC in which Greg has a good supporting role in and his breakthrough as a film actor.
A family comprised of Richard Hooper (Robert L. Duncan), his wife, Susan (Marina Seretis) , their teenage daughter, Jen (Nicola Elbro), and young son, Ben (Leon Bourikos) try to deal with the tragic death of their son Todd with a move to a picturesque yet mysterious farmhouse in Montana.

Jen Hooper blames herself for the accident which took the life of her young brother and is not only guilt ridden but overly protective of Ben.

Jen quickly becomes convinced that something is not right with the house after peculiar occurrences with young Ben. Ben can't articulate what he's seen since he stopped speaking when his brother died, and Jen's story is met with skepticism by her parents. The creepy neighbors next door only add to Jen's suspicion that her father’s "dream house" is turning into a nightmare.

Mayhem ensues when the parents leave Jen alone to babysit young Ben. The creatures from the attic attack and Jen isn't about to lose her only remaining brother. Now the guilt and shame that has haunted her is the only thing keeping her and her brother alive.