BBC has announced that the actress -- who played The Brigadier's (Nicholas Courtney) daughter Kate Stewart, as UNIT's scientific adviser, in Season 7 of the series -- will reprise the role for the "Doctor Who" 50th anniversary special.
Redgrave joins the Tenth Doctor (David Tennant) and his former companion Rose Tyler (Billie Piper) as well as "Harry Potter" actor John Hurt and Joanna Page for the "Doctor Who" 50th anniversary special.
The special will also see the return of the Zygons, the shape-shifters who, aside from flashbacks, haven't been a part of "Doctor Who" for more than three decades.
Filming is underway on the "Doctor Who" 50th anniversary special, which will be a 3-D spectacular shown later this year. "Doctor Who" executive producer and writer Steven Moffat penned the script and Nick Hurran is directing.
BBC tweeted a photo of Tennant and current Doctor Matt Smith at the first table read.
"Doctor Who" airs Saturdays at 8 p.m. ET on BBC America.