The Wikipedia article is a good read.
Launched from the EUROSEC Space Centre in Portugal, Kane and Ross are connected to "Heart Lung Kidney" machines that maintain them in stasis for a six-week round trip onboard their Phoenix spacecraft.
Bwahaha, what? Put in stasis for a
six-week trip? I'll assume stasis was mandated for reasons other than a need to conserve toilet paper.
For broadcasts in the United Kingdom, Doppelgänger has appeared under the Journey to the Far Side of the Sun title and has been formatted accordingly.[1] Transmissions have often included an inverted picture due to a mistake made in transferring an original master print to videotape.[1] Prior to a screening in the 1980s, a telecine operator viewed the print and, being unfamiliar with the plot, concluded that the parallel Earth sequences had been reversed in error.[5] An additional "flop-over" edit restored the image to normal, which became the standard for all broadcasts but compromised the plot: if Doppelgänger is screened with this modification, the viewer is led to conclude that the parallel Ross has landed on the "normal" Earth after the Dove disaster.[5]
