Defend Your Planet! (also cited as Attention Earthlings: Defend Your Planet!) was a Henson produced game show concept/pilot. It was mentioned a few times by Henson officials and appeared on Henson.com's Featured Creature section. The concept consisted of human contestants facing off against humorous puppet aliens to win in a battle of wits and strengths to save the Earth (and win prizes).

The initial concept was developed in 1996 and an alien game show host and his sidekick (both designed by Ed Eyth) were later built. A pilot episode of the children's game show was produced; however, the pilot did not sell and the show never went into full production. Victor Yerrid was among the puppeteers.

It was at the auditions for the pilot that Noel MacNeal was first considered for the role of Bear .

Concept sketches include a character with an exposed brain, a feature which would later be seen in the character design for Craniac.

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