Where is the Missile Expansion in Overgrown Cavern (Metroid Prime Origins)?

The Missile Expansion is in Overgrown Cavern, Tallon Overworld. To get there you need Missile Expansion, Space Jump, Morph Ball, Morph Ball Bomb, Charge Beam, Varia Suit, Wave Beam, Boost Ball, Super Missile, Spider Ball, Ice Beam first (starting a new game).

What you need first

Starting a new game from Landing Site, get these first, in this order, then go to Overgrown Cavern (130 rooms in all):

1. Missile Expansion in Landing Site (0 rooms; needed for Missile Expansion (Missile))
2. Space Jump in Alcove (1 room; needed for Missile Expansion (Space Jump Boots))
3. Morph Ball in Ruined Shrine (10 rooms; needed for Missile Expansion (Morph Ball))
4. Morph Ball Bomb in Burn Dome (13 rooms; needed for Missile Expansion (Morph Ball Bomb))
5. Charge Beam in Watery Hall (7 rooms; needed for Wave Beam (Charge Beam))
6. Varia Suit in Sunchamber (7 rooms; needed for Wave Beam (Varia Suit))
7. Wave Beam in Chapel of the Elders (20 rooms; needed for Ice Beam (Wave Beam))
8. Boost Ball in Phendrana Canyon (8 rooms; needed for Ice Beam (Boost Ball))
9. Super Missile in Observatory (10 rooms; needed for Spider Ball (Super Missile))
10. Spider Ball in Quarantine Cave (9 rooms; needed for Ice Beam (Spider Ball))
11. Ice Beam in Antechamber (39 rooms; needed for Missile Expansion (Ice Beam))

Last stretch

From Antechamber, door by door:

1. Antechamber: go through the door to Reflecting Pool → Reflecting Pool (Ice Door; needs Ice Beam)
2. Reflecting Pool: go through the door to Save Station 3 → Save Station 3 (Missile Blast Shield; needs Missile)
3. Save Station 3: go through the door to Transport to Tallon Overworld East → Transport to Tallon Overworld East
4. Transport to Tallon Overworld East: take the elevator → Transport to Chozo Ruins East assumed
5. Transport to Chozo Ruins East: go through the door to Transport Tunnel C → Transport Tunnel C (Ice Door; needs Ice Beam)
6. Transport Tunnel C: go through the door to Overgrown Cavern → Overgrown Cavern (Ice Door; needs Ice Beam)

More Missile Expansions

• Missile Expansion (Burn Dome)
• Missile Expansion (Crossway)
• Missile Expansion (Dynamo)
• Missile Expansion (Dynamo)
• Missile Expansion (Furnace)
• Missile Expansion (Gathering Hall)
• Missile Expansion (Hive Totem)
• Missile Expansion (Main Plaza)
• Missile Expansion (Main Plaza)
• Missile Expansion (Main Plaza)
• Missile Expansion (Ruined Fountain)
• Missile Expansion (Ruined Gallery)
• Missile Expansion (Ruined Gallery)
• Missile Expansion (Ruined Nursery)
• Missile Expansion (Ruined Shrine)
• Missile Expansion (Ruined Shrine)
• Missile Expansion (Training Chamber Access)
• Missile Expansion (Vault)
• Missile Expansion (Watery Hall)
• Missile Expansion (Watery Hall Access)
• Missile Expansion (Fiery Shores)
• Missile Expansion (Storage Cavern)
• Missile Expansion (Triclops Pit)
• Missile Expansion (Elite Control Access)
• Missile Expansion (Elite Research)
• Missile Expansion (Fungal Hall Access)
• Missile Expansion (Fungal Hall B)
• Missile Expansion (Main Quarry)
• Missile Expansion (Metroid Quarantine A)
• Missile Expansion (Metroid Quarantine B)
• Missile Expansion (Phazon Processing Center)
• Missile Expansion (Security Access A)
• Missile Expansion (Frost Cave)
• Missile Expansion (Gravity Chamber)
• Missile Expansion (Ice Ruins East)
• Missile Expansion (Ice Ruins East)
• Missile Expansion (Phendrana Shorelines)
• Missile Expansion (Phendrana Shorelines)
• Missile Expansion (Quarantine Monitor)
• Missile Expansion (Research Lab Aether)