SELECT "No. in series" FROM table_29519 WHERE "Title" = 'Shock Waves'
List the series number with the espide called 'shock waves'.
CREATE TABLE table_29519 (
    "No. in series" real,
    "No. in season" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "U.S. viewers (millions)" text
)