Alias the Jester

Alias the Jester was a time traveller bold
Through sheer bad luck his ship got stuck in the Earth's magnetic hold.
From the middle of space
To the Middle Ages

A children's cartoon from Britain's Cosgrove Hall, which featured an alien time traveller named Alias, who crashed into Earth in the Middle Ages. There, he adopts the disguise of a Jester, and gains employment in the court of King Arthur (just a King Arthur, not the King Arthur). Hilarity Ensues.

The series lasted from November, 1985 to February, 1986. A total of 13 episodes in a single season.

Tropes used in Alias the Jester include:

Anachronism Stew
Clark Kenting: The king and court have no idea that Alias, the weird flying space guy is the same person as the Jester. Because he's wearing a different hat.
Ear Wings: Boswell has a pair of small but functional wings sprouting from his head. There's reason to believe that Alias (never seen without a hat that covers the sides of his head) does too.
Film Felons: A band of robbers get into the castle by posing as a film crew on location. Alias spends most of the episode distrusting them without being quite sure why before he finally remembers that film hasn't been invented yet.
Flight: One of Alias's alien powers.
George Jetson Job Security: The first episode ends with Alias being hired. Every subsequent episode ends with him getting fired.
Horny Vikings: Raid the kingdom in one episode.
Human Alien: Alias.
Incredibly Lame Pun: Most common reason for Alias to get fired.
It Will Never Catch On: Several of Meredith the Magician's inventions.
Limited Wardrobe: Each of the regular characters has only one outfit, except Alias, who alternates between his one jester's outfit and his one set of Space Clothes.
NameDar: Played for Laughs when Alias encounters a small slimy creature and makes an involuntary noise of disgust -- which turns out to be the creature's actual name.
Non-Human Sidekick: Alias's pet dog(like creature), Boswell.
Once an Episode: "Jester!" "Yes, your majesty?" "You're fired." "Yes, your majesty."
Snap Back: But he always has his job again by the beginning of the next episode.
Time Travel: Only in the Backstory, though.