The 4th Season of Star Trek Voyager is the best yet. Kes' character moves on to a higer plain of existance in the 2nd episode and the new character Seven of Nine is introduced.
There are some great episodes in the 4th season which are as follows:
Scorpion Part II
After Janeway creates a temporary alliance with the Borg they work with Seven of Nine to develop a way to defeat their mutual enemy.
After Seven of Nine is cut off form the Borg collective, The Doctor begins to remove her implants while Kes undergoes many transformations
Day of Honor
After ejecting the warp core and Paris and Torres retrieve it, the reveal their love to each other.
After getting stranded on an alien planet, some of the locals coerce Chaoktay into helping them fight a war against their enemies.
Voyager recieves a distress call from an alien hologram. He reveales that his ship was infected with a virus. The hologram begins to go crazy.
After Seven's Borg implants start to regenerate, She attempts to rejoin the Borg collective.
When the crew of Voyager begin getting strange sicknesses, it is revealed that a cloaked alien ship is conducting medical experiments on them.
Year of Hell part I
Voyager is repeatedly attacked by a hostile alien ship with a temporal weapon. With half the ship destroyed, Janeway calls for
abandoning the ship
Year of Hell part II
After most of the crew has evacuated, the remaining crew try to stop the temporal weapon.
After Torres has hostile thoughts against an telepathic alien who bumps into her, she is arrested for having "violent thoughts" and is obligated to undergo a potentially damaging memory purge.
Some of Voyager's equipment is stolen and is tracked to a nearby planet. Janeway discovers that her Leonardo da Vinci holodeck program merged with the doctor's emmiter putting DaVinci's program on the planet
After Neelix is killed in a shuttle accident, Seven reveals knowledge of a procedure which can bring him back to life.
After the crew starts having virtually identical nightmares, Chakotay learns that a sleeping alien race is causing it.
Message in a Bottle
Voyager discovers a Federation ship on the other side of the galaxy through a network of alien relay stations. When they send
the doctor's program to the ship to call for help, the doctor learns that Romulans have taken over the ship.
After making sucessful contact with the Fedearation the crew starts recieving letters from their families. The aliens who own the relay stations, the Hirogen are furious at the fact that their stations are being used by Voyager and try to stop them.
After discovering a member of species 8472, the aliens who nearly destroyed the Borg, a member of Hirogen demands that he be allowed to continue hunting it.
When Voyager is in trade negotiatons with a trader, Seven claims that he forcefully extracted Borg implants from her body.
The Killing Game part I
The Hirogen has captured Voyager's crew and repressed their memories and replaced new ones into them to creat a simulation of WWII with the Hirogen as the German army and Voyager's crew as the French resistance.
The Killing Game part II
The Doctor works to restore the memories of Voyager's crew while fending off the Hirogen.
Vis a Vis
An alien species uses Paris' DNA to turn herself into a duplicate of him.
The Omega Directive
Voyager's encounters an alien race manufacturing an extremely dangerous and supersecret molecule. Federation law requires them to destroy the molecules and all knowledge of their existance by any means necessary.
A female alien is brought on board voyager and tells Chakotay that they used to be in love but has to erase his memories of it
700 years in the future, the doctor's program is reactivated in an alien museum which has rewritten history about Voyager.
Voyager discovers a fuel source on a "demon class" planet which is dangerous to even approach. They look for a way to get the fuel off the planet
Voyager encounters a large nebula that would take a year to go around and only month to go through. The problem is that only Seven is immune to the radiation in the nebula. The crew are put in stasis so they will be unaffected. Seven and the doctor are the only ones operating the ship.
Hope and Fear
A member of a highly intelligent alien race who was nearly wiped out by the Borg claims to be able to decrypt a message that Voyager recieved from Starfleet. The mesage says that they sent an experimental ship to an area near them which will enable to get them home in months. Though Seven suspects it may be a trap the alien set to get revenge on Voyager for helping the Borg.
There are special features on the DVD which have not yet been announced at the time of this review being submitted.
This is a season that one should not miss.