First Appearence: August 2nd, 1986
First Death: August 2nd, 1986 (killed by Matrix)
Reappearence: Late 2004/Early 2005, Transformers Armada and later Energon.
Re-killed: Late 04/ Early 05. Destroyed by the Matrix in Armada, body possessed by Megatron which is later destroyed by Optimus Prime powerlinked to Omega Supreme.
Krannix: A planet...that destroys every living thing in its path..
Kup: so thats the munsters name..
Transformers the Movie, 1986
megatron:i belong to nobody.arrrrggggggghhhhhhhh
Unicron better appear in the next live movie.
Also note that Unicron had epic voice. And oh ya, the movie takes place in the year 2005, so it all happened 2 years ago...
Unicron:"For a time…I considered sparing your wretched little planet Cybertron. But now, you shall witness...its dismemberment!"
His most recent appearance (that I am aware of) was in a somewhat weakened state, being an extremely powerful tank-like Transformer, rather than a demonic planet omnigod.
Megatron: No one... summons me!
Unicron: Then it pleases me to be the first.