Joe Morden

Agent for the Shadows aboard Earth Alliance station Babylon 5, where he served from 2258 to 2261. In his former life, an officer aboard the Icarus on an expedition to Z'ha'dum. (To this end, was briefly held for questioning by Captain John Sheridan in 2259.) Returned to Z'ha'dum to negotiate with Sheridan in late 2260. In 2261 fled to Centauri Prime to form a Shadow colony, but was killed by Londo Mollari to atone for his involvement with them.
(My favorite B5 bad guy, BTW.)

In the Babylon 5 universe, the agent for the Shadows aboard the station. Played by Ed Wasser.

Morden served with Anna Sheridan aboard the science vessel Icarus on its ill-fated expedition to Z'ha'dum. He arrived at B5 in 2258, where he approached Londo Mollari with offers of assistance to the Centauri. Captain Sheridan captured him briefly in 2259, but released him. He fled to Centauri Prime in 2261, where he was executed by Londo.