U.F.O.
A alien ship is sighted approaching the sun, creating massive climate changes across the Earth. The Thunderbirds prepare to intercept the UFO, and face the ultimate challenge: the unknown.
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More from this season
S1 E1
Firefall
The Thunderbirds disobey orders and head out into space to aid a close friend who's trapped aboard the space station Rosinante with a critical reactor.
S1 E2
Computer Madness
The lunar colony Moonbase Omega is in peril when its computer goes berserk and imprisons all the residents.
S1 E3
One Of A Kind
A fire breaks out in the Rocky Mountains, endangering all wildlife there. To make matters worse, one of the Thunderbirds is having a breakdown from family troubles.
S1 E4
Snowbound
In the Alps, a monorail is trapped under an avalanche on the eve of a severe storm, and with air running out for the passengers the Thunderbirds must work fast.