Well I'm retired from the business but this is genuinely my favourite show I have seen in
years and I would not mind seeing it get an accurate ranking somewhere, and somebody did ask me to help out so why not. Here are all of the notable feats that I found (I plan on uploading clips of the series to my personal Youtube channel later so feel free to request any clips you may need I suppose)
In the logo Voltron destroys the moon:
http://i.imgur.com/wXt2pRF.gif
In the first episode a ship's crash explodes over most of a mountain. Pidge made a scanner that can scan the entire solar system. Shiro also says Zarkon destroyed planets before, and considering that he spent a year trapped in his empire he's not exaggerating.
The blue lion alone not only flies to space in seconds, but also zips straight to Kerberos which is at the edge of our solar system in what Pidge says is 5 seconds, not minutes. That would be over 2000c since Pluto is like 3 billion km away. This scales to Zarkon, the other lions, robeasts, and Voltron itself for obvious reasons
Allura says all the planets in the solar system were destroyed by Zarkon, and it's confirmed that Voltron is the most powerful weapon in the universe which is why Zarkon fears it.
Furthermore the unfused lions react to the ion cannon which propogates at the speed of light and the castle's particle barrier can withstand it, despite it being capable of reducing "any planet to cosmic dust" (I shouldn't have to explain why this is legit)
Sadak's beam is like a black hole according to Pidge, do not know what to make of this if anything but Voltron overpowers the aforementioned "black hole beam"
Zarkon conquered almost all the known universe in a matter of 10000 years. Considering that he does not seem to use wormholes I feel like this may lead to good upgrades in the future
The red, black and green lions are shown to be sentient and move by themselves when the pilots are in utter despair much like in the original series, they are much stronger then (will expand more on this later)
Balmara is literally a living planet.... Voltron is still considered the most powerful being in the universe.
Generic Galra ships can damage the particle barrier which has planet level durability due to withstanding the ion cannon. The individual lions could survive the blasts.
A robeast's blast can affect a living planet to the point of killing it and even destroy the particle barrier, which again has planet level durability. It can also survive a particle cannon blast. Considering that the individual lions could endure the blasts and damage it, along with Voltron itself going toe to toe with and defeating it, this is more proof of MFTL+ and planet level+ Voltron.
Allura and a crystal can restore the planet's energy and light up the entire planetary surface. Via luminosity this is probably island level to some extent even disregarding restoring the Balmera's energy (not sure what to make of that either)
Zarkon beats the hell out of the red lion in the finale, and says "you may have a lion, but in your fledgeling hands it is weak" which, much like in the original, explains why the strongest weapon in the universe has trouble against lower tier opponents; the pilots hinder Voltron, they are inexperienced. Voltron is at its strongest when acting on its own. Thus, the robeast battles and Zarkon fight are both justified.
tl;dr the individual lions are all planet level+ and MFTL+ on their own as are the robeasts and Zarkon, let alone the fused form of Voltron. I think that you would be hard pressed to find feats for, say, the paladins though. Allura could bend steel doors when transformed into a Galran, the paladins in armour are certainly above regular Galrans and all that jazz
