Ice King flying down and attacking
Adventure Time main lineup
Phase 1: Simon as a regular man.
Phase 2 : Skin turns blue and hair is unkempt, signifying his spiral into insanity.
Phase 3: Hair turns grey, skin becomes more blue, and obvious progression into Ice King.
Phase 4: The final stage we see before complete transformation. By now, Simon's teeth are pointed and his hair - which is now white- is growing longer with the addition of a beard.
Simon Petrikov now fully transformed into the Ice King.
Ice King in Simon's clothing
Ice King asking Finn and Jake to take him out to party
Ice king dancing with bears
Ice King drinking with tree people
Ice King preparing to attack tree person
Ice King revealing his witching eye and ghost pouch
Finn attacking Ice King down a snowy hill
Ice King tying up his bride for the weeding
Ice King, Finn and Jake watching the two old swans kiss
Ice King "winning" a race in a river
"Marriage is the most beautiful thing in the world."
The flute broke before hit Ice King
"Do you know what Ice King means?!"
Ice King mirror and reflection
"...And other times it's like crazy, crazy, crazy in your face all the time."
Ice king in Project Exonaut
Ice King as the Nice King
Ice King on the Cartoon Network Video/Game Player
Ice King from Fusion Fall
"Look, a supermodel! Look, a hoverboard! Look, the apocalypse! Someone got hit in the boingloings!"
Back when the Ice King was human
Ice King mutating from the powers of the Ice Crown
Ice King (Simon Petrikov) before being fined by the crown
Ice king barfing ice in the treehouse in the episode: HITMAN
Ice King and Marceline Singing
Ice King and Marceline hug
Simon and young Marceline
Ice King howling for Finn's fake death
Ice King's head used in the design for the CN Comic-Con booth
Animated Ice King's fight with Flame Princess