Voltron: The Third Dimension

Evil threatens the safety of the galaxy. The maniacal Prince Lotor escaped from his prison in deep space. He formed a secret alliance with the mysterious Witch Haggar to destroy all that is good. With Lotor's escape, the heroic Voltron Force realized that they were needed once more. With the aid of their robot lions, the space explorers must once again form the mighty robot known as Voltron to protect the universe from Lotor and Haggar's forces of Doom. The Galaxy Alliance, under the leadership of Amalgamus and the reformed King Zarkon, have called the space explorers and their lions together again to form Voltron: The Third Dimension.

(Source: Wikipedia)