After winning the Parola Sands Motor race in Move - And You're Dead, Alan Tracy calls Grandma, from the parking lot, then drives to her house in his BR2. Having collected Grandma, Alan heads off for a rendezvous with Thunderbird 2, but their car is hijacked by Victor Gomez and Johnny Gillespie, who force them at gunpoint to drive out on to the centre of the San Miguel Bridge.
Alan and Grandma are made to climb up on to the girders of the bridge, then with a sonic wave generator in place, Gomez and Johnny steal the BR2, leaving the Tracys to their fate.
Thunderbird 2 arrives, and using a Neutralizer Tractor, Brains neutralises the sonic wave generator to enable Virgil Tracy to manoeuvre a Jet-Air Transporter on to the bridge underneath Alan and Grandma.
Alan falls from the girder, but is caught on a cushion of air emitted by a powerful jet engine on the back of the transporter. Grandma jumps from the bridge and also lands safely on the cushion of air. They escape from the bridge just as the bomb explodes. Grandma is then taken back to Tracy Island which then becomes her home.