I know that Highlander makes Master Yi immune to slows. Does this mean that he can withstand the 99% movement speed reduction to destroy the Thresh's The Box in less then a second?
ACTIVE: After a 0.75 second delay, Thresh summons 5 spectral walls
around him that last up to 5 seconds. Enemy champions that touch a
wall take magic damage and are slowed by 99% for 2 seconds, but break
the wall. Once one wall is broken, the remaining walls deal half
damage and apply half the slow duration. An enemy can be affected by
multiple walls.
Best Answer
If you're Talking about a real game the answer for a 1 second removal of the cage by a single champion is NO. The Builds + Champions required are useless and damage of the ultimate is too high to pull this off
However if you are in a custom game and you have unlimited resources of movementspeed buffs/items then the answer is yes. Because of Yis immunity to slows he can just run through with let's say Zilean Speed up, Boots of swiftness, 4 Zephyr + 1 Mercurial scimitar. You can also pull this off in one second with Olaf by the way but this would require even more movementspeed buffs.
If you don't want to clear it in 1 second but still only with one person I can think of 2 Other champions apart from Yi that can do this without any help.
Leblanc:
Position yourself on an edge wherever one wall will appear. Walk right into the next wall (the edge where you positioned yourself in) and jump to the opposing wall. From there jump right into the corner of the remaining walls and voila, his ult is no more.
Shaco:
Start the same as Leblanc (corner) But with your clone on the opposite site. Move yourself into the wall and your clone and after 2 walls are gone Jump to the last wall. (This could even work within 1 second but it's complicated)