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.