The Betrothal of Sontar (comic story)

Summary
The Doctor and Rose Tyler land on the icebound world of Serac where they encounter the Sontaran crew of The Betrothal of Sontar, a mining vessel commanded by Colonel Snathe, whose quest for the "Worldbane", a source of incredible power, has driven him insane. As the Doctor attempts to help Snathe find the Worldbane -- mainly in order to recover the TARDIS -- Rose befriends Lerox, an unusual Sontaran who possesses a conscience, and who holds the key to saving not only the Doctor and Rose, but the homeworld of Sontar itself.

Characters

 * Tenth Doctor
 * Rose Tyler
 * Colonel Snathe
 * Commander Lerox
 * Thanatos the Worldbane
 * Sontarans
 * Inuk

Continuity

 * The Doctor claims to have a "souped-up metabolism" that prevents him from getting cold; he later displays this ability when visiting a similar ice world in DW: Planet of the Ood.
 * The Sontarans appear with the Tenth Doctor for a second time in DW: The Sontaran Stratagem and The Poison Sky, the latter of which coincidentlly features Rose Tyler on a computer screen for a few seconds.
 * The Sontarans wear the classic series armour.
 * The Sontaran homeworld as Sontar. This is one of the first Doctor Who stories to indicate this as the name of the Sontarans' homeworld, predating the first on-screen reference to the name in The Sontaran Strategem.