The complete set is available in the Futurama: Volume Four DVD/VHS box set . Key Story Arcs & Character Development
The episode "The Why of Fry" explains that Fry’s cryonic freezing was not an accident but a plan orchestrated by the Nibblonians to ensure he would be in the future to save the universe. Futurama - Season 4
While it is the fourth production season, Fox broadcast these episodes across its fourth and fifth seasons. The complete set is available in the Futurama:
The season builds significant romantic tension, culminating in the operatic and emotional finale, "The Devil's Hands Are Idle Playthings" . Essential Episodes Futurama - Season 4