Babylon 5 was, in retrospect, one of the most influential sci-fi shows on the past two decades. It demonstrated that TV sci-fi could be clever and could have ongoing storylines, with proper world-building; it also showed that you could use CGI for all your space scenes, without models. It affected Star Trek: DS9 while that show was still being made.
Twenty years later, and the surviving Babylon 5 cast recently reunited with creator J Michael Straczynski for a panel in Phoenix, which you can watch below. Along for the show were: Julie Caitlin Brown, Jason Carter, Claudia Christian, Robin Atkin Downes, Jerry Doyle, Mira Furlan, Stephen Furst, Peter Jurasik, Walter Koenig, Bill Mumy, Tracy Scoggins, Pat Tallman and Andrea Thompson.
Amongst its revelations: Michael O'Hare had to leave the show because tragically, he was suffering from mental illness, including paranoia and hallucinations.