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Gas Leak is a popular, hazard team-themed band that shows up in random places for surprise concerts. In Through the Looking Glass, Hayley and Etienne were mistaken for Gas Leak while trying to cover up a portal to the Monster World. Etienne ultimately played to the Gas Leak fans with a keytar, and the real Gas Leak band received overwhelmingly positive fan reaction for Etienne's fake Gas Leak concert.

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