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Abbadon is an IL-series Cylon in command of a Cylon population on a planet centered in the path of the Canopus wormhole.
Abbadon is very concerned that an "infidel" Cylon basestar, blasted out of the sky by other Cylons under his command, is not completely and utterly destroyed. He orders Cylon bombers to return to the planet of Burania to finish the job, and orders a stealth Cylon team to watch over the planet for any intruders.
The stealth team detects Apollo and Starbuck's presence. They follow the two Colonial Warriors back to the Fleet, and make a boarding action on the science deck of battlestar Galactica (TOS: Battlestar Galactica: Cylon Apocalypse 1).
Unable to prevent the Colonials from obtaining the nano-cybrid, and refusing Adama's desire for a less violent settlement, Abbadon sess Tessida under attack, the now-weaponized nano-cybrid infecting everything.
Knowing that the incoming Cylon fleet would not arrive to help them but assist in their destruction to prevent further use of the nano-cybrid, Abbadon willingly chooses the self-destruction of his planet (TOS: Battlestar Galactica: Cylon Apocalypse 4)