Two extra DVD episodes of Durarara!! Episode 12.5 
Happens between episodes 12 and 13. A UFO is supposedly spotted in Ikebukuro, but what is it really? Episode 25 
Happens after episode 24, the final episode. Shizuo's brother hosts a TV special downtown, but his life is apparently in danger.

In Tokyo's downtown district of Ikebukuro, amidst many strange rumors and warnings of anonymous gangs and dangerous occupants, one urban legend stands out above the rest—the existence of a headless "Black Rider" who is said to be seen driving a jet-black motorcycle through the city streets. 
Ryuugamine Mikado has always longed for the excitement of the city life, and an invitation from a childhood friend convinces him to move to Tokyo. Witnessing the Black Rider on his first day in the city, his wishes already seem to have been granted. But as supernatural events begin to occur, ordinary citizens like himself, along with Ikebukuro's most colorful inhabitants, are mixed up in the commotion breaking out in their city. 
(Source: MAL Rewrite)

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