Marvel: 7 Heroes Who Have Never Beaten Kang The Conqueror
Josh Davison
Split image of Kang the Conqueror, Silver Surfer, and the Avengers.
Split image of Kang the Conqueror, Silver Surfer, and the Avengers.
Kang the Conqueror is one of the most infamous and dangerous villains in Marvel Comics. He first appeared in Avengers #8 by Stan Lee and Jack Kirby, though he technically debuted earlier as Rama-Tut in Fantastic Four #19 by the same creators. Kang is a time-traveling menace that has endangered all of reality on countless occasions.
Kang has battled the Avengers and Fantastic Four dozens of times over the years, and he has had his fair share of both losses and victories. Being that he is such a monumental danger, it's no surprise that there are many heroes across the Marvel Universe that have had yet to overpower the Conqueror

7 Ghost Rider And Kang The Conqueror Tend To Travel In Different Circles

Ghost RIder Johnny Blaze
Ghost RIder Johnny Blaze
Ghost Rider, in all of his incarnations, is the Spirit of Vengeance and one of the most powerful forces in the Marvel Universe. Despite his ordained role of punishing the wicked and guilty, this hasn't led the Ghost Rider to encounter Kang the Conqueror in any of his forms. Even the newer Cosmic Ghost Rider, being a time-displaced being himself, hasn't taken on Kang. That said, Ghost Rider generally faces mystical and demonic threats, so it should perhaps be no surprise that he's not turned his attention towards Kang.
If the two were to fight, it's difficult to tell who would be the victor. Kang is a brilliant schemer with a myriad selection of powerful and destructive technologies, but the Ghost Rider is a force of nature that is quite hard to put down.

6 The Champions Haven't Taken On Kang The Conqueror

Miles Morales Champions
Miles Morales Champions
Speaking of the Ghost Rider, the Champions haven't fought Kang the Conqueror either. The original team of Ghost Rider, Hercules, Black Widow, Darkstar, Iceman, and Angel had a relatively short existence that never crossed paths with Kang.
The newer version of the team with Ms. Marvel, Nova (Sam Alexander), Spider-Man, (Miles Morales), Viv Vision, Ironheart, and Brawn among others haven't faced Kang the Conqueror either. When Spider-Man, Ms. Marvel, and Nova were part of the Avengers, they did have a brush with Kang, but it didn't end in a definitive takedown of the villain.

5 Kang Doesn't Consider The Thunderbolts A True Threat

The Thunderbolts have had a relatively short yet impactful history in the Marvel Universe. Though this team of reformed villains has fought the likes of Graviton, Arnim Zola, the Grandmaster, and the Purple Man, they've not actually encountered Kang. He did observe their battle against Graviton but deemed them not a true threat to his plans.
When the Thunderbolts were based out of the Raft and run by Luke Cage and John Walker, the team had their own time-hopping adventure caused by an anomaly and the Man-Thing. While they were displaced across time, they faced Doctor Doom and even their past selves, but Kang never entered the picture.

4 The Silver Surfer Has Yet To Face Kang The Conqueror

Silver Surfer feature
Silver Surfer feature
The Silver Surfer is his own kind of cosmic force of nature. While he no longer works for Galactus and has no preordained role to fulfill, he is nonetheless a universal constant that often shows up for the most severe reality-shaking threats. Kang certainly qualifies as a major threat to all of reality, but the Silver Surfer has yet to take him on (despite their paths crossing during Infinity War).
Again, it's difficult to determine who the true winner would be in such a duel. The Silver Surfer is among the most powerful begins in existence, but Kang is crafty and quite difficult to outmaneuver.

3 Kang Hasn't Yet Decided To Battle The Defenders

The Silver Surfer's erstwhile allies in the Defenders haven't faced Kang as a team either. Namor, Hulk, and Doctor Strange have had their own individual encounters with Kang that have ended in victory for Banner and Strange, but the unified Defenders haven't had to test their mettle against the Conqueror.
It's likely that the team would win given the massive amount of power behind it, but one can be certain of nothing when it comes to matching wits with Kang the Conqueror.

2 The Guardians Of The Galaxy Have Actually Been Helped By Kang

Darkhawk and the Guardians of the Galaxy
Darkhawk and the Guardians of the Galaxy
The Guardians of the Galaxy surprisingly haven't had to take on Kang the Conqueror either. In fact, the team has been aided by Kang on one occasion. The team was trapped in a future ruled by Adam Magus and the Universal Church of Truth, but Kang the Conqueror arrived and gave the team a Cosmic Cube to use in their battle against Magus. He then sent them back to their own time.
Kang always has his own motivations that often can seem baffling to outside observers. However, it's easy to guess why he doesn't want a future where the Universal Church of Truth rules everything; because that means it's not ruled by Kang.

1 Spider-Man Hasn't Had A Decisive Victory Over Kang The Conqueror

Spider-Man webswinging past a skyscraper.
Spider-Man webswinging past a skyscraper.
Spider-Man (Peter Parker) has had a handful of passing encounters with Kang the Conqueror whether it be in the original Secret Wars or fighting a Spider-Man android built by Kang. Spider-Man even recently teamed up with Kang in King in Black: Symbiote Spider-Man by Peter David and Greg Land.
However, Spider-Man hasn't had to fight Kang the Conqueror head-on yet, and it seems very unlikely that the Web-Head could do it on his own given Kang's immense power and grand intellect.