Every Transformers animated series has had an ending.
"The Transformers" (aka "Generation 1") ended with adult Spike restoring the dying Cybertron to it's pre-war glory. Although Prime stated that "there will always be Decepticons", the Autobots now fully possess their planet which is restored and vibrant again, wrapping up the plot established in the first episode.
"Beast Wars" ended with the defeat of Megatron, taking him back to Cybertron for trial.
"Beast Machines" ended with the destruction of Megatron and total reformation of Cybertron into a techno-organic world.
"Robots in Disguise" ended with Galvatron's capture.
"Armada", "Energon" and "Cybertron" had endings involving defeating Unicron (though I don't know the details because I haven't watched them yet).
"Transformers: Animated" is slated for another season, though the defeat of Megatron by Omega Supreme would've been a satisfactory closing.
"The Transformers" (aka "Generation 1") ended with adult Spike restoring the dying Cybertron to it's pre-war glory. Although Prime stated that "there will always be Decepticons", the Autobots now fully possess their planet which is restored and vibrant again, wrapping up the plot established in the first episode.
"Beast Wars" ended with the defeat of Megatron, taking him back to Cybertron for trial.
"Beast Machines" ended with the destruction of Megatron and total reformation of Cybertron into a techno-organic world.
"Robots in Disguise" ended with Galvatron's capture.
"Armada", "Energon" and "Cybertron" had endings involving defeating Unicron (though I don't know the details because I haven't watched them yet).
"Transformers: Animated" is slated for another season, though the defeat of Megatron by Omega Supreme would've been a satisfactory closing.