The Frieza Saga covers from the time the Z warriors go to Namek up to the end of the fight with Goku and Frieza.

  This saga starts off with Gohan, Krillin, and Bulma going to namek to use the namekian dragonballs to wish their friends back to life. They use the space ship which Kame used to travel from Namek to Earth. After a long journey they arrive on Namek. Vegeta makes his way to Namek aswell. he found out about the Namek dragonballs from one of Frieza's outposts in space where he was healed. Basicly Frieza and Vegeta want imortality and they are willing to do anything to get their wish.
  Eventually Vegeta kills most of Frieza's henchmen, Dadoria, Zarbon, Kui, and various ground troops. But Frieza manages to get all of the dragonballs the only problem is, he doesnt know how to use them. Vegeta steals the dragonballs from Frieza's ship, and the Ginyu force is called in to retreive them. Meanwhile Goku is healed from his battle against Vegeta and Nappa on Earth. He begins to travel to Namek with a Capsule Corp. ship to help out his friends.
  Goku makes it to Namek just in time to help Gohan. Vegeta was defeated by Reccome and so was Krillin. Goku is alot stronger due to his healing, and because of his gravity training on his way to Namek. He uses his swift speed to take out Recoome and Burter. Jeice escapes to get Capt. Ginyu, and Vegeta had killed Guldo already. Goku gives out senzu beans and asks Vegeta for his help against Capt. Ginyu. Vegeta agrees but as soon as Ginyu arrives Vegeta leaves to steal the dragonballs. After a long, hard, and extremely odd fight with Ginyu, Goku is victorious but badly wounded. Vegeta kills Jeice and places Goku in an Isolation chamber which speeds up the healing process.
  After learning that you need a namekian password to use the dragonballs, Gohan goes to get it from Dende. Meanwhile Dende had already left to give it to the Z fighters. Guru, who is the gaurdian of Namek has a run in with Frieza who is looking for the password. His gaurd, and strongest Namek on the planet goes to fight Frieza. Nail knows he is no match for Frieza but he tries his best and does a great job of stalling Frieza. This gives the Z fighters enough time to receive the password and use 2 wishes.

1.) Bring Piccolo back to life
2.) Bring Piccolo to the planet Namek

  Frieza meets up with the Z fighters and this is where the big battle begins. Piccolo runs into the beaten up Nail and fuses with him which makes him extremely powerful. After some time Piccolo meets up at the battle feild where everyone had been holding up. Piccolo does a wonderful job of fighting Frieza in his second form. But, Frieza transforms into is 3rd form and Piccolo is no match. Dende is killed, Vegeta is even killed, but when all hope is lost Goku appears. Goku isnt even a match for Frieza but he finds a weakness in him. He finds that Frieza cant detect ki without a scouter and he uses this to his advantage. Baadly wounded, Goku decides to use a Genki Dama... which is his last hope. Piccolo, Krillin, and Gohan both do their best to hold off Frieza and Goku successfully completes his Genki dama. Frieza receives a direct hit and is presumed dead.
  sitting peacefully on some rocks the Z fighters are glad that Frieza is gone. Unfortunately for them Frieza reapears and kills Krillin right on the spot. because of Goku's best friend being killed he goes through a transformation. He becomes the first super saiyan in over 1,000 years. Its all down hill for Frieza after this. He is defeated. During the final battle with Super Saiyan Goku and Frieza Kame uses the Earth Dragonballs to wish back all the people killed on Namek at the hands of Frieza. Guru then uses the last Namek wish to Bring everyone on Namek except for Goku and Frieza to Earth.