Never Cross The Doctor

If there's one person in all the Omniverse you NEVER cross, under ANY circumstances, even the most dire, it's The Doctor.

The most powerful race in the Universe, the Daleks, had a mass-destruction weapon which would erase all of reality, leaving the Daleks the last race in existence.

The Doctor stopped them.

The High Council of Gallifrey were going to destroy Time itself, and many realities in the process, and move on to a higher plane of existence.

The Doctor stopped them.

The Doctor died before his companion's eyes.

He came back.

The Doctor stepped into his own Time Stream, which would easily severe his body and rip it into a million pieces in time and space.

He emerged out alive, and with his companion, too.

The Doctor's TARDIS exploded and destroyed all existence, including the Time Vortex itself.

The Doctor used the Pandorica to stop it in a Time Lock, and he came back.

Whenever the Doctor dies, he comes back, maybe not how you're used to, but he always comes back

Always.