Davros (Palindrome)

In one universe where the only Kaled/Thal war happened "millennia ago" and the two races lived in peace, Davros was married to a Thal called Charn. Still a scientist (AUDIO: Palindrome) like his genocidal counterpart in the Doctor's universe, (TV: Genesis of the Daleks) his life intersected with said universe due to the invention by him and his wife of a portal to the multiverse. Stranded there, he began devolving into a simulacrum of the local, Dalek-creating Davros, (AUDIO: Palindrome) whom the Daleks merged together with other Davroses into an individual whom the Dalek Emperor placed in stasis and hid away — in the belief that the duplicate Davros might prove useful at some point. (AUDIO: Restoration of the Daleks)

Origins
Waking up five days after the first operation, a Dalek attack gets Charn, The Doctor and Bliss killed, and while trying to escape a Dalek shoots the inter-dimensional portal causing this Davros to travel up his own timestream.

After trying to figure out what was happening and meeting Bliss and The Doctor, he ended up talking to a future version of himself, (that he was not aware was his future self) he got convinced that he needed to destroy the portal to stop the suffering.

This caused him to travel to the very first activation of the portal where The Dalek Time Strategist to came through. After talking The Dalek Time Strategist convinced Davros to help him restore the Daleks and destroy The Doctor (after finding out he was a Time Lord) by combining every version of every Kaled in the multiverse into one being.

By doing this it started to change Davros. He started to change from his Kaled form to a more recognisable ‘decayed’ version and needed the assistance of his chair to move.

Eventually Davros met his past-self and convinced his past-self to destroy the portal and after trying to kill The Doctor and Bliss but finding out they could not die due to the portal; he concluded that he needed to destroy the portal once all of his Daleks were fully stabilised. (AUDIO: Palindrome)

The Daleks did stabilise in the end, but The Doctor and Bliss managed to escape to N-Space where they warned the Time Lords. (AUDIO: Dreadshade)

Amalgamation
The Daleks then used the parallel Davros as a dimensional anchor around whom they drew out, and merged, versions of Davros from several different timelines, reconstituting a passable imitation of the original Davros, (AUDIO: Restoration of the Daleks) who had previously been lost to the Daleks when his command ship flew into the jaws of the Nightmare Child, albeit to be rescued by a temporally-displaced Dalek Caan and later reemerge in the post-Time War universe. (TV: The Stolen Earth/Journey's End)

Having only needed him to reestablish themselves, the Daleks soon turned on their reconstructed Creator. The resurrected Dalek Emperor tried to kill him, but sparked a small-scale civil war in the process. Seeing use in the Davros simulacrum, the Dalek Emperor ultimately decided put him in stasis while waiting for his next use. (AUDIO: Restoration of the Daleks)