name the fictional character who was in mystery science theater 3000 and portrayer is gamera vs . gyaos ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_series dbr_Mystery_Science_Theater_3000 sep_dot var_uri dbo_portrayer dbr_Gamera_vs._Gyaos sep_dot var_uri a dbo_FictionalCharacter brack_close