The most recent appearance is in episode 404 error, a troll episode in a modded copy of his world, where Etho ends the episode with Spaz, who has grown 2 heads on the sides of his head, returning with a nuke, but melee killing etho.
General Spaz returned in Etho's second LP World. Well actually in his dream. He was facing himself that he didn't know what was the sound. He thinks it was Wilson. But as he turns around, he sees the general, riding his car, trying to run him over. But as he fails, he blows up, sending Etho in the air and landing very hard that he died.
In the YOGSCAST series Flux Buddies, after investigating the nuke, Duncan and Kim see a death message saying "General Spaz withered away". Duncan checks the player lists and finds no one but them, so there must have been mob named General Spaz.