The Marvel Cinematic Universe is at it's high-point, with its last installment being the praised, Captain America: Civil War and will continue to be great with the new fresh take on the mystic arts in Doctor Strange. Doctor Strange features one of the best ensembles of the Marvel Cinematic Universe yet and will open the door to a new part of the Marvel Cinematic Universe. Beware of SPOILERS, as this post will take you on a journey through the Marvel Cinematic Universe.
Thunderbolt Ross (alias the Red Hulk) has played a big role in the Marvel Cinematic Universe, from 2008's The Incredible Hulk, to the last outing of the Captain America trilogy. Thunderbolt Ross opted to be turned into the Red Hulk, because of his hatred for the Hulk and wanted to be gifted with the power of the beast. The biggest difference between the two Hulks is that he doesn't transform when angry, but by will and emits massive radiation the more enrage. This major transformation could've happened in Captain America: Civil War, in an after credit scene or as the Abomination's replacement in the The Incredible Hulk. Actor, William Hurt has gain new titles in the Marvel Cinematic Universe under its government, but has he ever been a red behemoth? Red Hulk is still possible even after phase 3, because he leads a team of Thunderbolts, which is basically the Suicide Squad without being forced!
The immediate response to seeing the Nova Corps in the Guardians of the Galaxy, is where is the "Human rocket"? Yes, Richard Rider is one of the most notable characters when it comes to the cosmos of the Marvel Universe. Arguably considered as Star-Lord's best friend, as the two even died together. Richard, unlike Captain Marvel shares the same backstory with Hal Jordan of the Green Lantern Corps, as both were empowered by a dying alien and became the prominent of their Corps. The bucket-head has been entitled to one fan theory that seems plausible, which involves the Nova Corps in the Guardians of the Galaxy, using the power gem as a base to grant its users of the experiment with abilities. The process could be featured in Guardians of the Galaxy Vol. 2, or introduced the wielder in Avengers: Infinity War. Director, James Gunn has mainly approach the Nova situation with a resounding neutral response, so it all depends.
Beta Ray Bill
You're probably wondering who is the upright horse above and why is it dressed in Thor's attire. Well, this horse like creature goes by the name of Beta Ray Bill and he is the sole protector of his roaming race, the Korbinites. While on a path through the universe to keep his race alive from the evil Surtur, he discovers a conflicted Thor and they go blow for blow. The battle results in Thor's defeat as Beta Ray Bill is deemed worthy by beating the demigod with his own hammer, and then later on he gets his own hammer, the Stormbreaker from Odin. The two would soon become allies and help each-other through their toughest battles, like Ragnarok. Beta Ray Bill could still make an appearance in Thor: Ragnarok, as casting is still underway and a resembling skeleton of the Korbinites appeared in Guardians of the Galaxy!
Doctor Strange will showcase a new infinity stone that could only be between the soul stone and the time stone. The soul stone is usually simultaneously connected to Adam Warlock, but being that Doctor Strange is all about magic, the soul stone might fit him better. Adam Warlock’s cocoon can be seen in Guardians of the Galaxy, within the Collector’s collection, but his sister, Kismet is confirm to be in the second outing. One thing that the Collector might also have in his collection is the time gem as he also had an infinity stone in the comics, before he gave it to Thanos. The time stone sounds more suitable for Adam Warlock, as it can be the reason why he is an adult and explained his immense powers, such as immortality, divine powers, and his superior intelligence. Warlock could have appeared in Guardians of the Galaxy Vol. 2, but in a mid or end-credit scene, or better the Avengers: Infinity War! A role like this could call for Johnny Depp or Luke Evans!