Exterminatus2 - Dr Who(Daleks)/WH40k

Across the universe and its myriad dimensions The Time War raged, it did not spread or last for it had always been and would last an infinity, yet it was already decided even before it began.

The Dalek war Cruiser, occupation class, Designate enemy name "Infinite superiority", number 190,000,006 XL of the sub group Galactic Super-cluster 000A2, built on the rim of the Andromeda galaxy was falling.

It lacked the advanced facilities & defences of the DARDIS or the raw fire-power and multiple shields of a saucer class offensive cruiser, yet it had been part of the final battle part of the great push against enemies of the empire.
Yet, unlike those ships which had been targeted by the countless defences of the enemy planet it had been ignored due to it's insignificant nature in the conflict that had stretched across the dimensions and had encompassed the entirety of time.
And yet after the final push against the hated enemy homeworld past it's defences it had been at the foremost attack group (Number 72,000 of the mere 10 million units in the first wave).
Yet it had somehow been carried away when the final weapon had been deployed and used by The Doctor, The great Enemy of the Dalek empire in all of it's galactic fortresses across time and space.

It Crashed.

Cetis Alpha V was a small planet, the second from it's Sun an unexceptional red sun, it's most advanced local species were a species of carnivorous worms with a hive mind that reached the intelligence of an Ork in sufficient quantity and a species of parasitic lamprey shaped birds.

Its records in the journal of the Rogue trader "Cleansing Light" noted the unexpected mass extinction of life on the southern continent due to a crash from what appeared to be a fragment of a space Hulk and a request was sent to investigate.
After 61 years the request was granted by a minor official working in the prime administration Spire of the Sector Governor in the Hive world "Terus Migro" however by this time the Rogue Trader's flagship had fallen a foul of a cult, and for his laxity in allowing his son to start a cult on his ship the ship-master was executed after the retaking of the ship to ensure the check of any heretical traitors.

So the wreckage of the ship went unnoticed even as despite the death of it's crew members certain systems began to self repair after absorbing the local fauna to begin the eventual regeneration of its mission assigned, skill subset baseline crew members.