Info:

The short focuses on a boy named Pen (the character who would later be renamed Finn) and a dog named Jake as they learn from Lady Rainicorn that the Ice King has kidnapped Princess Bubblegum, in the hope of marrying her. Declaring that it’s “Adventure Time”, Pen and Jake set off for the Ice King’s mountain lair. Pen and the Ice King fight while Jake remains outside flirting with Lady Rainicorn, ignoring the battle. Just when Pen seems to be gaining the upper hand, the Ice King uses his “frozen lightning bolts” to freeze Pen in a block of ice. For unexplained reasons, this transports Pen’s mind “back in time, and to Mars” where he has a short motivational conversation with Abraham Lincoln…