The incredible first instalment of the seven part programme was on Antarctica, and showed us animal lives with all their ups and downs in glorious high definition, with creatures from sea spiders to leopard seals to penguins taking centre stage.
However, the moment that had us - and everyone else - in bits focused around a grey-headed albatross chick.
After falling from its nest in a storm, the freezing baby albatross was shown desperately trying to reunite with its family, only to be rejected by its parent.
Sir David explained that due to evolution the baby's parents didn't see it as their own, and so ignored its attempts to rejoin them.
Adult albatrosses don't identify their offsprings by sound, smell or sight, only their presence in the nest, and so once the fluffy little'n had fallen it looked like there was no going back.
"OMG those albatross are breaking my heart. Bless," one viewer wrote.
While another added: "The whole of the UK MUST be willing the poor albatross chick back into that nest".
"Was anyone else holding their breath watching the albatross chick trying to climb back onto its nest? #SevenWorldsOnePlanet," a third wrote.
However, luckily the defiant albatross eventually managed to defeat the odds and wrestle its way back into the nest, where its parent proceeded to acknowledge it again.
This wasn't the only tear-jerking albatross scene the crew witnessed, as as the show launched, its executive producer Jonny Keeling told reporters there was another heartbreaking moment where an albatross was swept away in a storm, which they didn't capture on camera.
"Climate change has bought storms that are more frequent and powerful... winds now regularly reach 70mph," David said on the show.
The documentary went on to warn that the albatross population has decreased by over half in the last 15 years, and is now on the verge of extinction.
Citing climate change as the cause, the documentary urged that was had to protect the planet immediately in order to albatrosses and hundreds of other creatures to stand a chance.
Each episode of Seven Worlds, One Planet will take a trip to a different continent, showing the animals that live in it today and the threats they're facing as a result of nature and climate change.
Seven Worlds, One Planet continues Sunday at 6.15pm on BBC One.
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