Doctor Who the Three Doctors Mmpb

"A classic novelization starring the first three Doctors! A mysterious black hole is draining away power from the Universe. Even the Time Lords are threatened! The Doctor is also in trouble! Creatures from the black hole besiege UNIT Headquarters. The only person who can help the Doctor is himself! The Time Lords bring together the first three incarnations of the Doctor to discover the truth about the black hole and stop the energy drain. Within the black hole they meet one of the very first Time Lords - Omega - who gave his race the power to travel through time. Trapped for aeons in the black hole, he now plans to escape - whatever the cost!"