How they compare: Time Master

Spoilers for Freedom Force. 

A genius doctor from another timeline, Time Master was paranoid of his own mortality and sought to prevent it for as long as possible with whatever he could until he discovered the Celestial Clock, the beating heart of the universe and the source of all time and causation. Gaining dominion over it, Time Master became the greatest threat to reality as he sought to stop the end of the universe, himself included, the heat death of the universe by ending all progression of time. He is the most feared entity in the universe, even the Alien Empire of Lord Dominion which has conquered all the universe but Earth and has mastery over energy x, the source of all metahuman powers, dare not trifle with him. 

Time Master is gargantuan, easily as large as buildings and capable of causing the ground to shake and damage to the street with merely his walking. But his true power is on a cosmic scale.

Time Master's power is great enough to threaten even the Celestial Clock, the heart of the universe that is the cause of all time in all realities and the procession of causation. During the sequel, the Chaos Witch Hero Alchemiss steals part of Time Master's power and the resulting power is so great as to turn her into Entropy, the Embodiment of Chaos in the multiverse itself, capable of warping the multiverse with her sheer presence. 

The Freedom Force, the Superhero Team of this universe desperately summons Time Master to battle Entropy herself, and the two are able to evenly match each other, able to damage each other with their strikes and their power seemingly even, with Time Master seeming to overpower Entropy at the end (though she uses her chaos powers to win by switching the possible and impossible). 

Time Master has a number of powers, mostly related to space and time. He can change his size at will. He can shoot energy beams which freeze what it hits in time, and can freeze beings in time with simply a gesture. He can fire a beam of pure energy X, the highly unstable energy that is the source of all metahuman powers, and can create a spacetime rift at will.

Time Master has also teleported in the Freedom Force base despite it's defenses against that exact thing, has sent a city block back to the Mesozoic Era, and can create clones of himself from other moments of time or from alternate reality versions of himself.

He can freely enter or exit the timestream (the linear flow of time) at will, and bring others with him. On the other hand he was also able to pull Entropy, the Multiversal Chaos Warper into a single timeline and lock her inside it and when she haxed him, he was able to escape by "fleeing through time" to the time of her being weaker after being beaten by Freedom Force. He also has slight regenerative abilities.

However he is even stronger in his own domain, the Celestial Clock. Time Master can access it at any time and bring others there as well. There, Time Master has access and knowledge of all timelines at once, complete awareness and control over all realities. The Celestial Clock is also inhabited and generates horrible wraiths which convert most things (though not Time Master) that they touch into horrible chaos entities or drain their life-energy until they are nothing.  

How would Time Master do in other verses?

In the DC Universe, Time Master would be approximately equal to the Lords of Order and Chaos or Anti-Monitor and would fittingly qualify as a Pre-Crisis Crisis Level Event. It would take the Pre-Crisis Justice League all together to fight him. He would be weaker then a high level God like Darkseid or Highfather should they choose to physically incarnate, but especially in the Celestial Clock it's possible he could slow them drastically to allow other entities to stop him.

In the Marvel Universe, Time Master would be roughly comparable to the Celestials or Galactus in terms of raw power and be a viable threat to the Abstracts like Infinity, Eternity and so forth who would be comparable to Entropy in Freedom Force. If he was in the Celestial Clock it is possible he would be able to even overcome them. It would take one of the supreme powers then to stop him

. 

In the Saint Seiya Universe, Time Master would be a threat comparable to the Primordials and which even very high tier gods like Athena, Apollo, or Hades would be unlikely able to defeat. That said the strongest entities of the verse like Zeus or the Primordials would likely be able to evenly fight him one-on-one especially if he is outside the Celestial Clock and if he tries to fight more then one at a time, he would almost certainly lose.

In the Doctor Who verse, Time Master would be comparable to the hyper-advanced civilizations such as the Eternals in both raw power and mastery of time, however it is highly unlikely he could survive the strongest weapons in the verse such as the Reality-Bomb which is capable of destroying an entire multiverse. 

In the Transformers Universe, Time Master would be roughly equivalent to God Entities such as Primus and Unicorn. It would be possible for him to solo anyone in the verse by drawing them into the Celestial Clock, however it would be highly doubtful for him to be able to normally given the number of these entities and number of abilities these entities have.

In the Cthulhu Mythos would register far above the titular Cthulhu in terms of power. He would be stronger then any archetype, a universe-transcendent entity capable of surviving the voice of Yog-Sogoth which has more force then the collisions of universes. He has vastly more power then one of the Great Old Ones, and would likely be comparable to the Elder Gods in terms of power. That said he would be absolutely nowhere close to the Outer Gods and his spacetime powers wouldn't affect them anyway.