The Tube descends and sucks Jonah out of The Satellite of Love and into the Backjack so he can perform the show open. It's less complicated than it sounds.

It seems to be a newer version and/or extension of the Umbilicus.

First seen in Experiment #1101 - Reptilicus.

The Satellite of Love
Primary Residents Joel RobinsonMike NelsonJonah HestonTom ServoCrow T. RobotGypsyCambotMagic Voice
Minor/Other Residents TimmyMike's RobotClayton Forrester and TV's Frank (mirror)Eddie Nelson (Alternate universe)NanitesWinstonM. WaverlyMatt Claude Van DammeGrowler
Visitors NuveenaEnochDemon DogsMonadPhantom of KrankorOrtegaGypsy (mirror)Tom Servo (mirror)Henry KissingerGoosioMikey the Mike spriteGlenn ManningEarl TorgesonFinneganLydiaDelivery ManBrain Guy
Terminology Hexfield ViewscreenRocket Number 9UmbilicusMovie signManipulator armsDeus ex MachinaHyper-warp escape shipsAirlockWhirlpoolJet ScreenThe Tube
Locations BridgeTheaterTheater hallwayMike's roomTom's roomCrow's RoomJoel's roomKitchen