As KMC's only Thundercats historian, Lion-O could potentially solo as well. While he hasn't shown the plot-strength He-Man has, he has:
-easily cut through massive boulders
-bested Panthro who likely a 100+ tonner in the Trial of Strength (one of the test to become Lord of the Thundercats)
-lifted and flipped over the ThunderTank as easily as pressing X in Halo to flip the M808B Scorpion
-dodged and deflected multiple incoming lasers with ease.
Don't forget about pulling Safari Joe's ship back down to Third Earth as it was attempting to escape the atmosphere. (Still nowhere near as impressive as He-Man holding back Horde Prime's starship with warp engines running, but it's nothing to sneeze at.)