list all episodes of the first season of the teletoon television series the avengers: earth's mightiest heroes !
select distinct var_uri where brack_open var_uri dbo_series dbr_The_Avengers:_Earth's_Mightiest_Heroes sep_dot var_uri dbo_seasonNumber 1 sep_dot dbr_The_Avengers:_Earth's_Mightiest_Heroes dbo_network dbr_Teletoon brack_close