Thunderbirds Are Go Episode 21 Comet Chasers Episode Title:Comet Chasers.Episode Description:Halley's Comet is passing close to Earth, and businessman Francois Lemaire goes on an ego trip with his unimpressed wife Melanie aboard his space yacht Solar Wind, so as to send live pictures back to Earth. Disaster strikes when Francois flies into the comet's tail, damaging his ship and causing it to lose contact with Earth. Thunderbird 3 is dispatched for search and rescue with Alan and Scott on board, Alan being particularly keen to see Halley's comet as it will be another 75 years before the comet passes Earth again.