Marvel comics is known for having a wide variety of incredibly dangerous villains and on that list is the oldest being in the universe known as Galactus. Galactus for those that don't know is a giant cosmic entity that can only survive by consuming planets. Born as a mortal man named, Galan, that lived during the previous universe (prior to the Big Bang) he merged with the sentience of his universe after it was destroyed which made him become the entity fans know today.
Galactus has been seen as both an ally and a foe in various Marvel comics depending on the storyline. He's often seen as a villain bent on sustaining his own life force and must be stopped at all costs. He's often accompanied by a group of Heralds that go out to search for potential worlds to consume, one of the most popular Herald is known as the Silver Surfer. He ends up recruiting the Fantastic Four and Earth's heroes in order to defeat Galactus though it's not anything close to being an easy task.
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Keep in mind some writers in the comics have said that Galactus' appearance is said to look different depending on which world he's invading because he's a cosmic entity. Whichever world he nears, the inhabitants perceive him as their own worldly perception. There's no telling how Disney will approach this specific aspect of the character but since Earth is a human planet, Galactus often resembles a human appearance. Disney may either decide to replicate the faces of these actors or just utilize their voices instead while going with his iconic classic comic book look.
Scott Lawrence
Scott Lawrence is known as one of the prominent voices for Darth Vader. Being capable of replicating what the legendary voice actor James Earl Jones has done during the live action Star Wars films. He's played Darth Vader in both animated shows as well as video games in properties such as Star Wars: Rebels and even Star Wars: Squadrons to name a few. His voice can be booming and if Disney is looking to find someone to play a galactic cosmic entity like Galactus then Disney will want to cast someone who's voice can carry while also striking fear. Lawrence is very good at replicating that aspect of Vader so it shouldn't be hard for him to make the switch into Galactus.
Ronald M. Banks
Ronald M. Banks is known for playing Quan Chi in the recent Mortal Kombat titles (Mortal Kombat 9 & X). Quan Chi for those who don't know, speaks in a "proper" or awkward manner which can come across as very old English. It often doesn't fit with the contemporary social cues or even humor of the characters who are from the present timeline. Specifically for that reason, it would be a good choice to have him play Galactus considering that he's the oldest living thing in the Marvel Universe since he was born before the Big Bang.
Richard Epcar
Going off of the awkward vintage way of speaking comes the third pick which is Richard Epcar. He has a wide range of characters, often known for playing roles such as the Joker and Ansem from Kingdom Hearts. However, the reason he's on this list is not for either of these two roles. It's actually for his time as Raiden in the recent Mortal Kombat games.
He fits in the same area as Quan Chi in terms of talking in older "eloquent" English which makes him feel out of place or not of earth. Raiden is also a cosmic entity known as an elder god in the Mortal Kombat universe so making the switch won't be something unseen. The actor also has range so Galactus would be a relatively easy voice to replicate in comparison to a voice like the Joker.
Christopher Judge
Known for portraying Kratos in the recent 2018 God of War video game, Judge is a very talented voice actor. If he can portray the God of War in the best way possible then the actor would be a perfect choice at portraying a character like Galactus. Many fans thoroughly enjoyed him being cast as Kratos because he was able to invoke the fear, anger and stoicness needed for a character like that. Kratos also has very iconic quotes that many gamers repeat to this day so having him play Galactus means Marvel fans will be repeating those lines as they walk out of the theater.
Andy Serkis
Andy Serkis has made a name for himself as the go-to for motion capture or VFX (Gollum, King Kong, and Caesar to name a few). He's able to effectively replicate characters who aren't even human which is a feat on its own. He's also directing the upcoming Venom sequel. Even though Serkis has already appeared in the MCU as Ulysses Klaue, there's no reason he can't disappear into another role. If his range can go from Caesar from The Planet of the Apes films and to Gollum from The Lord of the Rings films then the actor wouldn't be far off from playing Galactus.