Minha Irmã é um Extraterrestre
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Courtnee DraperMegan Larson
Tamara HopeAriel Cola
Lance GuestCosmo Cola
Khrystyne HajeKathy Larson
Vanessa Lee ChesterMichelle
Myles JeffreyTrevor Larson
Lauren MaltbyHeather Hartman- Aash AaronSoda Delivery Man
- Shane BarnesPizza Waiter
- Amy BridgeGirl in Science Class
- Wendy BroekhuizenPopular Girl #2
- Lachlan BurnettBoy in Science Class
- Michael CafferyMinister (as Michael Caffrey)
Amy LindsayBecca (as Katie Campbell)- Denver CrabtreeHenry
- Gabriella Di LabioTeacher in Washroom
- Kurt DuvalWindsurfer
- Matt EmeryHoward
- Henry FeaginsFanul
- Chris FoyMatt
- Julie FoxKid #2 in Cafeteria
- Chas GreenEarl
Brooke HarmanJill- Melanie McKeePopular Girl #1
Tiriel MoraS'Vad
Neil PigotFred Larson- Nigel RodriguesMr. Singh
- George SmiloviciShrink
Cecelia SpechtSerena Soo- Vanessa StrohfeldtKid #3 In Cafeteria
- Marlene ThaddeusWedding Guest
Cain ThompsonKid #1 In Cafeteria- John WalkinMusic Teacher
Thomas M. WrightCutter (as Tom Wright)