The reason for the trip to Canada is revealed today. A few weeks ago, Stephen and Mallory got an email from the Make-A-Wish Foundation saying that there was a 10-year-old girl whose wish it was to play Super Smash Bros. with them both, and appear on the channels.
Today, Stephen and Mal make that wish come true! They spend several hours playing Smash Bros. and Mario Kart with Ayrielle, and get a tour of EA's Vancouver offices. Also, everyone gets interviewed by a representative from a local news company, giving each of them a moment to express how grateful they are for this opportunity.
Ayrielle is an incredibly good Smash player: she hadn't held a GameCube controller before today, but she holds her own really well against Stephen and Mal. She receives some signed prints of Mal's paintings, as well as a StephenVlog keychain from Stephen. All in all, it's an unforgettable experience for everyone involved.