Dr Who - 141 - The Two Doctors - Synopsis
Dr Who - Colin Baker - Series 22 - ep 4 - tep 141
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The Doctor and Jamie are sent by the Time Lords to visit a scientific Think Tank in deep space they helped establish to protest about the dangerous time travel experiments being carried out there. It turns out to be a trap and the Doctor is caught. Later the (other) Doctor and Peri arrive to investigate the disappearance of the Doctor and Jamie, and are re-united with Jamie. Their investigations lead them to Earth where the Sontarans are backing a megalomanic scientist's dangerous experiments into time travel and genetic engineering.