- Season 9 - The Flash

Both returned to assist in pivotal moments, reinforcing the theme of legacy.

The series finale coincided with the birth of Barry and Iris’s daughter, Nora West-Allen. The Flash - Season 9

As a farewell to the Arrowverse , the season featured several high-profile cameos: Both returned to assist in pivotal moments, reinforcing

A introduced in the finale A list of all guest stars who returned for the final run to counter the threat.

Barry recruited a "Rogues Squad" of former enemies, including Hartley Rathaway (Pied Piper) and Mark Blaine (Chillblaine), to counter the threat.