Thunderbirds Are Go Season 3 Episode 15 - Signals Part Two Episode Title:Signals Part Two.Episode Description:Scott locates the Zero-X’s escape pod but it's stuck in sea sludge. When he tries to extract it, the pod starts to sink into the seabed, taking Thunderbird 4 with it. Despite Brains warning about using Thunderbird 2 as a submarine, Virgil and Lady Penelope take the ship down so that the magnetic grabs can reach Scott. Meanwhile, Havoc hijacks Thunderbird 3 with Alan and Kayo and the space pirates must use the Chaos Cruiser to get it back. After returning to Tracy Island, the family find out that the explosion of the Zero-X was actually a successful launch into deep space which means Brains was right, Jeff Tracy is alive. They now plan to build a new Zero-X to bring Jeff Tracy home.