The Top 4 competitors left in So You Think You Can Dance Canada will show their moves during a two-hour performance show Wednesday at 8 p.m. on CTV, prior to the live two-hour grand finale on Sunday, Dec. 7 at 9 p.m.

This week, guest judges and choreographers Blake McGrath and Luther Brown are back behind the judges' desk with Armstrong and Jean Marc Genereux.

The Top 4 will be performing routines Wednesday by choreographers familiar to So You Think You Can Dance Canada audiences from this last season: Paul Becker, Sean Cheesman, Sho-tyme, Stacey Tookey, Gustavo Vargas and Melissa Williams.

The Top 4 will perform in pairings with each other as they dance seven numbers in total, including boy/girl couples as well as performances with Allie and Natalli and Miles and Nico together.

The expanded performance episode will also feature a Top 4 hip-hop group performance choreographed by guest judge and choreographer Dan Karaty.

The Top 4 dancers performing next week are:

* Allie Bertram, 18, a ballet dancer from Calgary.

* Miles Faber, 21, a popper and boogaloo dancer from Calgary.

* Natalli Reznik, 28, a hip-hop/Latin dancer from Toronto .

* Nico Archambault, 23, a contemporary/hip-hop dancer from Montreal.