This is a major nostalgia moment for me. I loved the X-Men Animated Series. My brother and I would wake up early every Saturday morning to see it. I haven't watched any in years as I'm afraid I'll spoil the golden memories by viewing it in comparison to advances in technology, etc.
It is an epic show. I always loved Apocalypse. The voice acting for him was great. Here are a few of his best lines (there are some Apocalypse lines from later TV series mixed in as well)...
The very start when there is a crowd cheering Apocalypse and he is doing the benevolent dictator wave is from the last episode of Wolverine and the X-Men. Apocalypse never said any lines in season 1. Season 2 never happened. Season 2 would have featured Apocalypse heavily. Wolverine and the X-Men involved time travel a lot which I'm not a huge fan of, but the show was well done. First episode Xavier was knocked into a coma for 20 years and he was using a modified Cerebro to transmit his telepathy backwards 20 years. Exactly 20 years in fact, so if a day passed in the present, a day past in the future meaning Xavier's historical research could not be done leisurely. Season 1 was about Xavier guiding the X-Men into diffusing a massive war between Magneto's mutants and the Mutant Response Division killing 4/5 of the world's mutant and human population. Last episode of season 1 revealed that saving the world from that small "a" apocalypse paved the way for big "A" Apocalyse to take over the world (foreshadowed with scenes of Apocalypse watching season 1 events from the shadows and smiling). I am really bummed that the show was cancelled early. I blame Canadians for poor marketing. (Of course a Canadian animation company is going to give Wolverine top billing). Season 1 is on Disney+ and on my DVD shelf giving me one fewer reason to pay for Disney+. In the 1990s X-Men, I really liked when Apocalypse stopped in the middle of a fight to have an argument with himself and Cable is furious that Apocalypse is so preoccupied he doesn't find Cable worth smiting.