4. Original Cast Member Sylvia Anderson Will Guest Star!
One excellent piece of news about Thunderbirds Are Go! is that Sylvia Anderson will be featuring in it as Lady Penelope's appropriately named Great Aunt Sylvia. Anderson will be appearing in the episode Designated Driver, written by David Baddiel. Sylvia Anderson, of course, not only voiced Lady Penelope in the 1960s series but also helped to create Thunderbirds with her husband, Gerry Anderson. Her inclusion in the reboot is a heart-warming nod to the original series; one that will win an enormous amount of goodwill from long-time fans.