Using newly recorded and archive footage, the cast and crew look at the show from its creation through to transmission.
Puppeteer Judy Preece explores the Supermacromation concept.
Three devoted Terrahawks fans explain why they love the 1980s series as much as they do.
In August 1983 a film crew visited Bray Studios where Terrahawks was being filmed. The resulting film featured in an edition of "The Electric Theatre", and includes previously unseen footage.
Moya Griffiths, who was the real-life singer behind Kate Kestrel, performs the hit song that is a tribute to Gerry Anderson's 1960s hit, Thunderbirds.
Released on VHS in 1983, this compilation includes several minutes of footage from the pilot that were cut for timing. The master tape no longer exists, so it is included here from a VHS source
Steve Begg and Terry Adlam recall their time creating Terrahawks explosive model effects.
Series composer Richard Harvey reflects on his time creating the sounds of Terrahawks
Newly transferred from film elements, these special-effects shots feature outtakes not featured in the final episodes
Back in action after thirty years, the Terrahawks voice cast reflect on the original series
The Terrahawks cast look back at how they created the main character voices
Discover the features, good and bad, of a Supermacromation puppet, with puppeteer Judy Preece
Featuring previously unseen material, the cast and crew of Terrahawks reflect on the series and their involvement
Three Terrahawks fans reveal why they love it so much
Recorded for an edition of The Electric Theatre Show, Making the Unexpected includes all the footage from the original show, plus previously unseen material.
Newly transferred from film elements, these special-effects shots feature outtakes not featured in the final episodes
Newly transferred from film elements, these special-effects shots feature outtakes not featured in the final episodes
Zelda attacks NASA's outpost on Mars and establishes her home, then mounts an attack on Earth, forcing the Terrahawks into battle
The Terrahawks struggle to defend against the aliens' strange powers, and find they may be forced to stop the attack at the cost of Ninestein's life.
Zelda defrosts one of her monsters, Sram, who unleashes his devastating voice against the Terrahawks.
Sergant Major celebrates the day of his creation, whilst the master of infinite disguise, Moid, travels to Earth and takes the place of Hiro, who is being held captive in Antartica after being shot down by Zelda
The Terrahawks find a teddy bear-like alien adrift in a space capsule and take him back to Hawknest. However, he is actually one of Zelda's monsters and begins to wreak havoc in the base.
The Overlander is hijacked, but the hijacker, a news reporter by the name of Darrel, is a potential security hazard for the Terrahawks.
Yung-Star devises a way to make the Cubes more powerful by combining them. Zelda forms a group of them into a gun and threatens to destroy a newly constructed dam.
Ninestein enters an old-fashioned gun fight between one of Zelda's Cubes in the Arizona desert.
Zelda gives Sram another chance to defeat the Terrahawks by sending him to hijack the Overlander, an automated vehicle that delivers vital supplies to Hawknest.
An old space probe approaches Earth, but the Terrahawks worry because it was never meant to return.
The Terrahawks pick up a capsule in space containing only a strange vapour. However, it actually contains a gaseous monster that meddles with their minds.
Zelda attacks Earth on Christmas Eve, convinced that the Terrahawks' guard will be down. However, Ninestein anticipates such a move, and all-out war erupts. Perhaps the Christmas spirit can even reach someone like Zelda...
Zelda captures the crew of a space transporter, and will only release them if Ninestein offers himself as a hostage in exchange.
Zero and Dix-Huit roll to the rescue after Kate and Stu are kidnapped by Yung-Star and Yuri.
Kate is taken hostage by Andeburr Records employee Stuart "Stew" Dapples, who is under Zelda's control.
Kate Kestrel wins the world song contest and goes on to compete in the interstellar song contest. Zelda contends that as a resident of Earth's solar system she has a right to participate too, and challenges Kate to a sing-off on a neutral planetoid with her family and Sram as her band.
Zelda and the Terrahawks team up to stop Zyklon, a gigantic spaceship dedicated to destroying all life in the universe.
While pursuing a ZEAF, Hawkwing flies too high and is marooned in space.
Zelda dispatches Yung-star and a new monster, Lord Tempo, to find the location of Hawknest. While traveling back in time to avoid Spacehawk, they pick up King Richard.
When the Terrahawks are rendered catatonic by space flowers, Zero is forced to battle for the cure on his own.
The Terrahawk team do battle with the literally cold hearted Coldfinger, whose fiendish powers can reduce anything and anyone to a frigid state.
Moid, Master of Infinite Disguise, transforms himself into the Invisible Man to create trouble for the Terrahawks
Two Astronauts take a small Sporilla back to Earth...with devastating consequences.
A day in the life of Stu Phillips, as he witnesses the arrival of a U.F.O, only to have none believe what he says, except Kate.
Zelda deploys the alien Krell to Earth and plots the destruction of the space equivilant of Fort Knox
In this clip show, Zelda reflects on her previous attempts to kill the Terrahawks, and realises the time has come for new and more powerful monsters to be brought to the fold, whilst Cy-star has some important news
The aliens are preoccupied with the birth of Cy-star's child while the Terrahawks prepare to launch a sneak attack.
A stubborn, never-say-die military leader gains control of the Terrahawk outfit, and stages humanity's first full assault on Zelda's base on Mars, but is he fighting a war he can hope to win?
Zelda plants a hidden bomb on the Battletank, with Yuri positioned outside Hawknest, using his telekinesis to seal the Battlehawk launch doors shut, Ninestien and Mary find themselves trapped
The Terrahawks confront a metal-consuming monstrosity created by Zelda.
Itstar discovers how to duplicate Zelda's minions, and experiments on Yung-star.
Itstar masterminds its first attack, attempting to destroy the Terrahawks with a bomb.
Yung-star and Itstar are sent with Captain Goat to run a pirate radio ship to lure the Terrahawks into a trap
Tamura, a Samurai warrior from outer space, forces Zelda and Ninestein to meet on neutral ground in order to settle their dispute peacefully.
Yung-Star runs away, but he is unknowingly carrying a 'bug' in the form of a powder inside him.
Mary barly escapes the destruction of Spacehawk and arrives on Earth just in time to witness the bombing of Hawknest and the death of Ninestien...and then she wakes up, her experiance an apparent dream, but little does she know that she was merly the first victim of Lord Tempos' ""timebomb"", which soon finds a more suitable host in the form of Zero. Zero's inferior will power prevents him from resisting the timebomb, and it spreads through all of the Terrahawks's electronic systems, creating a possibly fatal time delay which Zelda capitilises on.
Zero has a malfunction, when he is put under the knife for an operation, he experiances a nightmare beyond his comprehension as Zelda finally infiltrates Hawknest, whilst Tiger and Mary experiance an identity crisis
Zelda lures the Terrahawks to Jupiter's moon Callisto by ransacking a listening post there. Once they arrive, they find themselves being stalked by the fearsome Sporilla.
Whilst exploring a meteorite, the Zeroids come across a huge nugget of Gold, they bring it back to Hawknest, unaware that it is actually a bomb created by Zelda. Upon it's arrival in Hawknest, the bomb is activated by Zelda, Ninestien manages to get the bomb as clear from Hawknest as he can, and the ensuing explosion claims his life...or does it?