Arc of Infinity As a powerful being from the antimatter universe attempts to bond with him, the Doctor is urgently summoned to Gallifrey. To prevent universal catastrophe, the Time Lords intend to execute the Doctor! Snakedance The dark evil of the Mara still exerts its influence over Tegan and brings the TARDIS to the planet Manussa. Can the Doctor free his companion before Manussa once again falls under the dominion of the snake? Mawdryn Undead The Black Guardian seeks vengeance, a group of tragic immortal mutants are desperate for death, and the Brigadier can't remember his oldest friend. It's a sinister mystery the Doctor must solve before it's too late...