There are few sights more awesome than Red Hulk fused with Venom and Ghost Rider, which came to pass in comic Venom: Circle Of Four. The Venom: Circle Of Four comic arc unites four of Marvel's biggest antiheroes, with X-23, Red Hulk, Ghost Rider (Alejandra Jones), and Venom (Flash Thompson) fighting together in a literally hellish battle. Demonic villain Blackheart opens a portal to bring Hell to Earth, and it's up to this motley team to work together to stop it. It's a sign of how far comic book movies have come in the last 20 years that nearly all of the above characters have received some form of live-action appearance.
Nicolas Cage took the lead for both Ghost Rider movies, while Gabriel Luna played the character during season 4 of Agents Of S.H.I.E.L.D. After his disappointing debut in Spider-Man 3, Venom finally scored his own solo adventure with the Tom Hardy movie of the same name, while X-23 played a major role in 2017's Logan. While Thunderbolt Ross has appeared in both Ang Lee's Hulk, played by Sam Elliott - who coincidentally also played a version of Ghost Rider in the 2007 movie - and in the MCU, where he was portrayed by William Hurt, Red Hulk has yet to appear in a movie. James Gunn (The Suicide Squad) once stated a dream project of his would be a Hulk Vs Red Hulk movie, though there's little sign of that movie coming to pass.
Part of the fun of comics is that writers can dream up some bizarre pairings, such as Batman Vs Elmer Fudd or Archie Meets The Punisher, and make them work. Venom: Circle Of Four could easily pitch itself as the comic where Red Hulk, Venom and Ghost Rider fuse together, but its a lot of fun in the lead-up to that moment too. The Hell on Earth plot is essentially an excuse for any number of cool setpieces, such as the main characters battling their hellish counterparts - with X-23 battling X-666, a demonic cheerleader - and being killed one by one.
This leads to them making a deal with Mephisto to come back to life to take down Blackheart, as Hell slowly starts to spread. This results in another battle, where Red Hulk is eventually merged with Venom and Ghost Rider. This fusion can shoot fiery webs and manages to defeat Blackheart by creating his own angelic counterpart. The portal to Hell is sealed, with Venom returning to Flash and the Spirit of Vengeance to Alejandra when the battle is won.
Venom: Circle Of Four isn't quite an essential read, but it's pulpy fun while it lasts. It feels like a story was reverse engineered around the moment Red Hulk, Ghost Rider, and Venom merge together, but the imagery of all these heroes fighting demons in a Hellish version of Las Vegas certainly makes up for a somewhat flimsy premise.