Weaknesses. Vibranium: Colossus' metal skin is vulnerable to the anti-metal Vibranium, as evidenced when Xraven stabbed his arm with a Vibranium blade which instinctively turned him back into his normal form.
Colossus isn't as durable as vibranium or adamantium. His skin is some sort of organic steel alloy that can heal but only in his human form I think. With vibranium and adamantium as 2 of the most durable materials in the Marvel universe, Wolverine and Black Panther could likely cut him.
When the team decided to sacrifice themselves to stop the Adversary, Colossus gave his life alongside them to save the world. Like the rest of the X-Men, he was revived by Roma and decided to let the world believe him dead while he and the X-Men worked out of an Australian base.
One of the most physically powerful X-Men, Colossus is a force to be reckoned with. He would be able to put up a good fight against Thanos and even get close to beating him but he wouldn't be able to keep Thanos down and that would be a problem.
Deadpool does his best to harm Colossus, but the metal skin and muscles of the Russian mutants mean that Wade can only break his wrists by punching him.
Juggernaut's power is unlimited, especially when sponsored by Cyttorak. And with his willingness to win any fight, he could even manipulate Colossus, though he's never been shown to be that clever. Juggernaut would really only need to land a single hit on Colossus to knock him out and make him lose him armored form.
There'd be no reason whatsoever for them to fight. But if they did, Colossus is just not at anywhere near Superman's level. Colossus' two best attributes are his strength and durability, and Superman has him far outclassed in each, even in his top level Juggernaut form.
Wolverine's Claws Can Cut Through (Almost) Anything
Even with the demon's fury, Colossus' skin manages to stand up to Wolverine's claws, meaning the mutant can't slice through everything (Captain America's shield being another notable object).
That very same power is a veritable death sentence against Magneto. While he has fought Colossus before, Magneto has been very kind not to rip him to shreds. After all, it would take little more than a thought for Magneto to turn Colossus' entire body into shrapnel.
Claremont, by the way, wrote the SECOND time that Wolverine couldn't cut through something with his Adamantium claws, which occurred in X-Men #102 (by Claremont, Dave Cockrum and Sam Grainger), when Wolverine tried to cut the Juggernaut... only to realize that that was not going to work out for him.
The two brawlers have fought beyond these two encounters, but these two fights establish a few hard facts: the Hulk can be overpowered by the Juggernaut; the Hulk cannot consistently stop the Juggernaut; and most importantly, the Hulk's strength, even at maximum, cannot harm the Juggernaut at his maximum power.
Colossus' ability to wield Mjolnir shows that he is pure of heart and ultimately good, despite recent actions calling into question his integrity. Colossus' heroic nature is evident in his willingness to sacrifice himself for others, as seen in the Legacy Virus storyline.
While Colossus' mutant ability offers the X-Man super strength and organic armor protection, his mutation couldn't save him from Captain America who didn't hesitate to kill Colossus in the most brutal way.
At least, it seems that way, until a few pages later, when it's revealed that The Hulk managed to catch the enormous mass of rock - which is said to weigh over 150 billion tons and span over two miles - and hold it over his head.
While kryptonite is Superman's greatest weakness, he's susceptible to other forms of energy and threats. This makes Billy Batson — aka Shazam, the World's Mightiest Mortal — one of Superman's greatest opponents. Batson can transform himself into an incredibly powerful adult body when he says the magic word "Shazam."
Physically, the answer is no. Juggernaut's momentum powers are magical in nature, and while Superman doesn't have a particular vulnerability to magic, as many think, he also doesn't have any more resistance to it than the average human.
Jean Grey is usually a person who prides herself on self-control and knowing her limits. The Phoenix removes both, and Darkseid would easily take advantage of that.
To stop Logan from healing, Deadpool hit him with a special type of weapon that inhibited his healing factor and the destroyed him. This was all before Colossus, Gambit, Rogue, Cyclops, Emma Frost, and others perished by way of Deadpool.
This feat means that even though Juggernaut's magic makes him unstoppable, Hulk has the overwhelming power to thwart Juggernaut's supernatural rules. But he still can't force him to surrender, or destroy him as he would need to for a true 'win.
While the upgrades give Juggernaut the powers to kill Thanos with ease, it comes at the sacrifice of the former villain, as Juggernaut is abandoned after the Mad Titan is taken down, as no attempts are made to save him as he accelerates through space.
Upon seeing Colossus, the monster stabs through Colossus with his adamantium claws. Even though Wolverine was transformed into a Wendigo, the moment illustrates just how powerful Logan's adamantium claws are. He pierced all the way through Colossus organic steel skin - that's no small feat.
Superhuman Durability: In his armored form, Colossus is completely bulletproof and invulnerable to most forms of bodily harm. He can also survive falls from great heights while in his armored body.
Colossus can convert the tissue of his entire body into an organic, steel-like substance analogous to osmium and to carbon steel that grants him superhuman strength (Class 100) and a high degree of imperviousness to injury.
