After escaping the captivity of the Time Lords fighting the Doom Coalition, the Eleven took Helen Sinclair as a hostage and hijacked a lone Battle TARDIS to pilot it into the Capitol. Caleera, enraged to have learned the extent of Padrac's manipulation, gave Helen some of her power to stop him. Helen used her power in part to pilot the Battle TARDIS into the Resonance Engine, destroying the Engine and saving the universe. (AUDIO: Stop the Clock)
The Battle TARDIS was heavily damaged, and in the words of Helen, "falling apart," when it finally met its end by crash landing on Rykerzon. (AUDIO: World of Damnation, Sweet Salvation)