Hmmm... According to Marvel,
Tales to Astonish 13
Incredible Hulk Annual 5
Marvel Swimsuit Special 2
Sensational Spider-man 1
Marvel Monsters: From the files of Ulysses Bloodstone 1
Marvel Monsters: Monster's on the Prowl 1
Nick Fury's Howling Commandos 2
Nick Fury's Howling Commandos 4
Nick Fury's Howling Commandos 5
Nick Fury's Howling Commandos 6
Annihilation Conquest Star Lord 1
Annihilation Conquest Star Lord 2
Annihilation Conquest Star Lord 3
Annihilation Conquest Star Lord 4
Annihilation Conquest 2
Annihilation Conquest 3
Annihilation Conquest 4
Annihilation Conquest 5
Annihilation Conquest 6
Guardians of the Galaxy 1
So it is his 20th appearance.
Which means the real key issue to grab is Annihilation Conquest 5.
Just to be clear, I guestimated that GOTG 1 was RRs 18th appearance, I could be off by a couple
Just to be clear, these look like Groot appearances and not RR. At least the top two are (and according to Marvel's Wiki page the Hulk Annual #5 was a robot Groot and not the real deal).
I was referring to the bold above where they asked if it was Groot's 2nd appearance. But if you must have a Rocket.... and if the Wiki is correct,
Marvel Preview 7
Incredible Hulk 271
Incredible Hulk 272
Incredible Hulk 279 (Image on a monitor)
Official Handbook of the Marvel Universe 10
Rocket Raccoon 1, 2, 3, 4
Official Handbook of the Marvel Universe 11
Official Handbook of the Marvel Universe Master Edition 9
Quasar 15
Sensational She Hulk 44, 45, 46
Marvel Legacy: The 1980s Handbook 1
Exiles 73
Annihilation Conquest Prologue 1
Annihilation Conquest Star Lord 1, 2, 3, 4
Annihilation Conquest 2, 3, 4, 5, 6
Guardians of the Galaxy 1
So GotG 1 is RRs 28th appearance.... and for the 18th appearance collectors, pick up Annihilation Conquest Prologue 1