Zastros 9

Zastros 9 was a planet that The Doctor's TARDIS accidentally landed on instead of Zastros 8. It was nowhere near as peaceful as its counterpart.

Here, Melanie Bush was chased by monsters while riding a battery-powered vehicle comparable to a skimmer. The Sixth Doctor tried to contact her through its communication device, but had trouble getting reception. The vehicle's battery started dying and the monsters were able to catch up to Mel and and damage her ride. The Doctor, unable to teleport Mel back to the TARDIS, instead telported himself in the "skimmer" and set off the ejector seats, which used retrorockets to land them safely by his parked TARDIS. The two then promptly left the dangerous world. (AUDIO: The Brink of Death)