SEASON 2 • EPISODE 3
Thunderbirds Are Go
"Deep Search"
Date Aired: Oct 29, 2016 (United Kingdom), Apr 20, 2017 (United States)
Thunderbirds 3 and 4 are called out to Europa, a moon of Jupiter, when a pair of documentarians fall into an ice ocean, leading Alan to make first contact with an alien lifeform.