Buuxi weedha soo socota: Théodore wuxuu ciyaaray ciyaartoy weyn oo yaryar oo ka tirsan Horyaalka Hockey-ga Junior Major Quebec (QMJHL), halkaas oo uu ku guuleystay Koobka Madaxweynaha isagoo ah horyaal QMJHL ah wuxuuna ku tartamay Memorial Cup kooxda Hull Olympiques sanadkii 1995. Wuxuu ku guuleystey labadaba Ford Cup oo ah ciyaaryahanka difaaca ugu sarreeya iyo Guy Lafleur Trophy oo ah MVP playoff sanadkii 1995 wuxuuna laba jeer ku guuleystey QMJHL Second Team All-Star. waxaa loo doortay kaalinta 44-aad ee ciyaartoyda Canadiens
1994, Théodore wuxuu siddeed xilli ciyaareed ka ciyaaray Montreal, halkaas oo uu ku guuleystay Vezina iyo Hart koobab, labaduba 2002. Sanadkii 2006, waxaa lagu iibsaday Colorado Avalanche, halkaas oo uu ka ciyaaray laba xilli ciyaareed oo buuxa. Théodore wuxuu sidoo kale laba xilli ciyaareed u ciyaaray Washington Capitals. Caalami ahaan, Théodore wuxuu billad dahab ah kula guuleystay Kanada 1996 World Junior Championships, halkaas oo loogu magac daray goolhayaha ugu fiican tartanka. Wuxuu sidoo kale u saftay xulka Canada tartankii adduunka ee 2001 wuxuuna ahaa taageere koobkii adduunka ee 2004.