Voltron: Lion Force, The Deadly Flowers

S1 E22: King Zarkon attack Arus with a beautiful shower of poisoned rose petals. The only cure lies under the water of Planet Lyra, but Allura is too sick to go. The Blue Lion is the only one that can operate normally underwater, so Lance borrows it and goes after the cure. The local leader, Farla, turns Lance over to the enemy, and Lance ends up in a duel with Prince Lotor! All alone, Lance doesn't have much of a chance, and if he can't win Farla over to his side, he'll never get the cure.