Tekkaman Blade takes place in the year 2300 AD. On a certain moment, the Radam attack earth. A few months after the beginning of the invasion, a tekkaman appears, he calls himself Blade and with the help of the Space Knights, Blade starts to fight the radam. But there are a few things that Blade isn't telling about his past.
 
(Source: Anime News Network)

10 years have passed since the end of the last war against the radam. A new team of Space Knights has been assembled under the lead of Aki and D-boy. The first mission of the new tekkaman is to defeat the radam but then, they have to fight against a remnent from the past.
 
(Source: Anime News Network)

The first OVA, Burning Clock, tells the story of the Aiba family, goes into further detail about Shinya and Takaya's rivalry.

The third, Missing Link, deals with the events between Tekkaman Blade and Tekkaman Blade II.

Tekkaman is just an average bright boy in his everyday life. However, modern science can turn him into a mighty space warrior. This becomes a reality when aggressive aliens come from space to invade our planet. Armed with a space lance, Tekkaman gallantly goes into action against the grotesque space creatures. During his battles he encounters a mysterious young man from another planet who helps him out whenever he is in danger. 
(Source: Absoluteanime)

Twin Blood is an alternate version of Blade and Evil's first battle, with drastically different character and mecha designs from the rest of the series. Blade/D-Boy does not need Pegas to transform and the armor more closely resembles the Radam humanoids from Tekkaman Blade II.

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