ITV Reveals New 'Thunderbirds' Characters

New images of Brains, Lady Penelope and Parker were unveiled, alongside the announcement that Sylvia Anderson, who voiced Lady Penelope in the original 1960s series, will guest star as a new character in an episode set to air later this year. Oscar-nominated actress Rosamund Pike (

Gone Girl, Pride & Prejudice

) will voice the new Lady Penelope.

"Thunderbirds Are Go," which is being co-produced by ITV Studios and Pukeko Pictures in association with Weta Workshop, will debut this spring in the U.K. on ITV and CITV.