It's hard to resist the siren callof the sea- and near impossible if you're a member of the X-Venture Xplorers! Jellyfish, pirates and assorted nautical naughtiness are no barrier reef to our team, and neither is time travel! A sinister circus is the key to their salvation, where the discovery of a mermaid egg sparks a scramble for victory! How will the team navigate through this murky mystery, and will they triumph in their travels to track ddown the truth? Flip a fin and come on in as we solve this MERMAID MYSTERY!