The 'Adventure Time' gender-swapped universe of Fionna and Cake returns on February 18th with the episode "Bad Little Boy" and in addition to the return of Neil Patrick Harris as Prince Bubblegum, this new episode introduces us to Marshall Lee voiced by none other than 'Community' star Donald Glover.

While the previous Fionna and Cake episode featured only a brief cameo from the male version of Marceline, Marshall Lee, the episode "Bad Little Boy" centers very heavily on the vampire rocker. Voiced by Donald Glover (who previously lent his voice to 'Regular Show,' another Cartoon Network series), Marshall Lee sings a new song, "Good Little Girl" to Fionna and presumably fights for her affection after her romance of Prince Bubblegum.

The episode goes as follows:

The princesses are sick and tired of Ice King’s crazy Fionna and Cake stories, so Marceline stops by the Ice Kingdom to show him how it’s done.

The episode 'Mystery Dungeon' may have given us a brief preview of "Bad Little Boy" as the end of the episode revealed that the Ice King was attempting to bring Fionna and Cake into the real world. Will he have success and will Finn and Jake and Fionna and Cake all co-exist?

Check out this long-ish preview of the new 'Adventure Time' episode "Bad Little Boy" below, which features Donald Glover singing and rapping his way through a new tune.

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