神秘组织·GOD看中了神敬太郎博士的人类工学技术，逼迫其加入，教授拒绝而遭袭击，儿子神敬介也被杀害，身受重伤的父亲为了让儿子复活，不顾自己的伤势，亲自执刀为儿子进行改造手术。敬介醒来后，父亲已死，透过计算机留言，敬介了解GOD欲危害世界的阴谋，于是背负起对抗邪恶的责任，成为第五号的假面骑士·假面骑士X。
故事背景设在明治64年，并由德川庆喜掌握权力的另一个日本。国家靠能量源「龙脉」，形成江户和科学混合的独特发展。但繁华背后，反体制派组织「蛇」正酝酿革命之火。德川政府委任暗组织「鵺」将其驱除。女主角-雪村笑羽在幼时被灭门，于是她作为「鵺」的处刑人，为报仇而持续寻找蛇野目……
In this season, the show went back to airing one new episode a week, but stayed in the hour-length format, filling up the second half-hour with episodes from previous seasons and some of the prime-time specials from the 1980s. This entire season, along with the second half of season 6, is available on Garfield and Friends: Volume 5 DVD set. Also worth noting is that here, a new theme song was added that was written by J.R. Johnston and Neil Panton. The theme was sung by J.R. Johnston. This theme song was not shown internationally, and as a result, it does not appear on the DVDs (although Garfield's quotations are kept intact). This new introduction sequence used most clips from Seasons 5-7 and a few from the first two seasons, as well as Garfield in Paradise and Garfield's Feline Fantasies. The episodes stopped using a few seconds of the theme playing in the episode title cards after season seven's fourth episode; music from the episodes were used in the title cards until the show ended, even though season six used music from some of their episodes.
