All the episodes from this Season are actually for the 4th Season.
Among the robots attending the party on the Galapagos Islands previously seen on other episodes include: Calculon, Roberto from "Insane in the Mainframe
", the Robot Mafia (including Clamps), Robot House Fraternity (including Gear Shift and Fatbot), the Robot Police officer, the Oliver-esque boy robot from "Mother's Day
" and "Xmas Story
", Fry's nervous explosive roommate from "Insane in the Mainframe
", the beeping robot from All my Circuits who sleeps with Calculon's wife, the grim reaper robot from "A Clone of My Own
", the chainsawing lumberjack robot from "Mother's Day
", the gigantic evil robot with spikes from "Mother's Day
", Izac from "A Flight to Remember
", the preacher seen in "The Honking
", Satan robot from "A Tale of Two Santas
", that train/bus with legs from "Mother's Day
" and the Slurm vending machine from "Fry and the Slurm Factory
". The hooker-bot 2000, with a heart of solid gold. And, of course, the Crushinator from "Episode Two: The Series Has Landed
", in a green bikini.