I was under the impression that each of the wizrds were sent to middle earth by the rest of the Ainur. One each from a select few of the valar.
They were sent to combat Sauron and his minions. Yet they were not allowed to fight power with power, which is why they didnt just attack Sauron outright. They had to gain the allegiances of the peoples of Middle Earth and persuade each of the races to fight against Sauron.
In the end, only Gandalf joined the last of the elves across the sea to Valinor because he was the only one of the Istari to fulfill his mission. Saruman betrayed the people of middle earth he was supposed to protect. Radagast turned his back on all but the animals, thus not fulfilling his mission. Alatar and Pallando were not with Gandalf in his ride to Valinor, thus they must not have fulfilled their mission as well.
What happened to the two, no one knows. They may have even been turned by Sauron as well.
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