Popeye(Samurai Jacks Timeline)

Astro from The Jetsons makes a cameo appearance as one of the three humanoid dogs that gang up on Scaramouch.
 * In the same episode, a robotic version of Popeye appears in the bar with other thugs.
 * Another cameo is from a green alien version of Usagi Tsukino during the rave
 * There also appears to be a background alien character reminiscent of a villain from the Hanna-Barbera series Space Ghost, Zorak, on the airship, just before the Woolies attempt to attack Ashi.