In Transformers: Cybertron (known as Transformers: Galaxy Force in Japan), Vector Prime was a Transformer ... keep Megatron from collecting the Cyber Planet Keys. Subsequent continuities ...

Yes, it would be fun to follow Groot back to Planet X, but the only way that's likely to work as a feature is if we get Guardians of the Galaxy 4 (which we know James Gunn won't be at the helm of).

The film where Groot returns to his home planet,” Diesel posted on Instagram. Diesel voiced Groot for 2014’s Guardians of the Galaxy and reprised the role in 2017’s Guardians of the Galaxy Vol.