The Hell's Gate Prisoners (ヘルズゲート囚, Heruzu Gēto Shū) are a group of aliens from Mirai Sentai Timeranger. These are Londerz Prisoners confined for the most evil and inhuman acts of the 30th century. Only Gien has the key to the vault that holds them, and he thaws them out so they can terrorize everyone for his own amusement and kill the Timeranger for himself (and the Don).