Ill try....
*SPOILER ALERT* for the animated movie, if anyone cares
At the start, you see Unicron devour a whole planet then .a voice over gives you a rundown on how the deceptecons took over Cybertron, and then gives a brief intro saying that the autobots are trying to claim it back, then it comes to the autobots planning to goto earth to get energon cubes to get enough energy to defeat megatron.
Ironhide and a few others take off and fly to earth only to be intercepted by decepticons and killed, the decepticons fly to earth and attack autobot city.
Optimus Prime arrives late, after getting a SOS from Blaster, and comes and has a massive fight with megatron, after the fight is over the decepticons flee and megatron is abandoned by starscream so they can get home, and so starscream can become the leader. meanwhile optimus tells about the matrix of leedership, which he gives to his 2IC Ultra Magnus. and promply dies.
Megatron is summoned by Unicron who then turns him into Galvatron, tells him that he has to destroy the matrix of leedership. He also gives him warriors from his fallen decepticons, he then goes and kills starscream and takes back the leadership of the deceptcons.
Autobots take 2 ships and take off, 1 ship carrying Hot Rod, Cup and the dino bots crash lands on this planet and hot rod and cup are sent to prison and are sentinced to death. they end up escaping and making a revolution on the planet and the sharkacons end up taking over from the evil leaders.. a quintesen, they meet wheelie who shows them a ship and they all escape the planet.
Meanwhile the 2nd ship, which is being chased by the decepticons, galvitron and co is split into ships so that the decepticons think they have destroyed the whole ship, the autobots then crash land on the planet of junk, and the decepticons come back after being told by Unicron they failed. galvatron corners ultra magnus, and kills him, takes the matrix of leadership. and then goes back to unicron to tell him that he is now the master. unicron isnt happy and sets his path for cybertron, as he is hungry.
The autobots meet the planet of junk inhabitants and after a brief battle hotrod shows up in his ship and they all become friends, then they take off and head to unicron to fight him. they all end up crash landing in unicrons eye, and then hotrod gets seperated from the rest, and end ups with unicron. Hot rod isnt strong enough to fight galvatron, but soon gets his hands on the matrix of leadership and turns into Roddimus Prime. he easily disposes of Galvatron and then destroys Unicron wiht the matrix.
Movie over, all the autobots survive except for optimus, while most of the decepticons just vanish lol. i dont think you get told what happens to them and who cares tbh, the autobots get cybertron back.
Sorry if its a little scratchy, its been about 2 years since i seen it...