"The Final Countdown" synth is the Sawtooth version of the "Lucky Man" synth lead which was made with Square waves.... both Synth Leads with plenty of portamento.
You could start from scratch or simply start with the Synth Lead "Lucky"
Classic Square wave sound. Navigate to the Element screens and change the two Elements to Sawtooths...
Press [PART SELECT 1]
In the screen touch "ELEM1" or press the first button in row three
Touch the box at the top that will let you select Waveform: Bank, Number, Category, Name
A pop-in menu appears...
I suggest using the PROPHET V Sawtooth waves to build this sound...
On the Search screen in the box with the magnifying glass type "P5"
This will find the seven Prophet V Sawtooth Waveforms ... each is either Sawtooth up or down, with different phase relationships- pick one for Element 1, another for Element 2; use two different ones to create a natural movement in the sound.
You can experiment with adding more sawtooths... by substituting the Waveform for "Lucky" we take a shortcut to setting up the portamento etc... but feel free to tweak to your liking.
That should get you close. Let us know.