Unicron as the most powerful and largest villain in the Transformers Universe is also the biggest villain anyone in the world has ever seen in comics, television and movies. In the Transformers Universe, Unicron transforms into a planet that devours others and serves as the chaos lord and brother of Primus. Once Unicron appears in the next 4 Transformers Cinematic films his voice needs to be done by someone with a deep dark tone that can be heard realistically in the cinematic films and not often in the cartoons and since the legendary actor Christopher Lee passed away due to cancer, old age and was no able to hold out any longer, the one actor that Michael Bay or his processors of directing movies 6 7 and 8 should cast as the voice of Unicron's cinematic version is Andy Serkis
Andy Serkis, an expert motion capture specialist who provided motion capture for Gollum in Hobbit and Lord of the RIngs trilogies, Ceasar in Rise and Dawn of the Planet of the Apes films along with the Upcoming Sequel War of the Planet of the Apes and as Supreme Leader Snoke, the main antagonist in the Star Wars sequel trilogy and since he has provided such a deep booming voice for Snoke in Star Wars the Force Awakens he should have just the right fitting tone of voice for Unicron in more of the upcoming Transformers films so if anyone agrees with my theory that Unicron should be voiced by Andy Serkis in the Transformers Cinematic Universe please convince Michael Bay and others at Paramount to line Serkis up on voicing Unicron straight away while there is still time.