Doctor Who vengeance on Varos [Colin Baker (The Doctor)]

"Varos is a planet ruled by fear and increasing poverty. As its inhabitants cower by their video screens, gleaning their meager entertainment from public executions scheduled within the mysterious Punishment Dome, the ruling officers enjoy a life of luxury, fat on their profits from the planet's major export -- the rare substance, Zyton-7. It is into this hellhole which the Doctor and Peri must go, as Zyton-7 is the only cure for the ailing Tardis' transpower system."
"On the planet Varos, prisoners and guards alike are subject to the severest forms of punishment, which are then broadcast to the masses as entertainment. For the Doctor, Varos is the only hope for him to locate the rare mineral Zyton-7, which powers his ailing TARDIS."@en
"On the planet Varos, prisoners and guards alike are subject to the severest forms of punishment, which are then broadcast to the masses as entertainment. For the Doctor, Varos is the only hope for him to locate the rare mineral Zeiton-7 to power his ailing TARDIS. Arriving on Varos, he and Peri are soon caught up in events beyond their control."@en
"On the planet, Varos, prisoners and guards alike are subject to the severest forms of punishment, which are then broadcast to the masses as entertainment. For the Doctor, Varos is the only hope for him to locate the rare mineral Zeiton-?, which power his ailing TARDIS. But when he and Peri arrive, they are caught up in events beyond their control."@en